Answer:
Descriptive study
Explanation:
Any research study can be classified into two groups
a) Descriptive and
b) Analytical study
A Descriptive study is also referred as non-analytic study as it involves understanding of something happening in a population as a whole since time frame being referred by doing through literature review, studying case reports, conducting surveys, doing comparisons and referring previous researches. It helps to understand prevalence, incidence, or experience of a group
While analytic study is based on establishing relation between two factors through experiment
Because the researcher had access to twenty years of data on the same participants in an education program, the researcher was able to perform a longitudinal study. This type of research is particularly powerful for tracking changes and developments over time.
Longitudinal studies follow the same group of individuals and assess them repeatedly across a protracted timespan. For instance, psychologist Rich Lucas was able to utilize longitudinal data from over 20,000 Germans across two decades to explore the implications of marriage on happiness. Such studies can reveal impactful insights into the long-term effectiveness of educational programs and behavioral trends but can also be resource-intensive to conduct.
Longitudinal research contrasts with cross-sectional research, which analyzes different segments of a population at a single point in time. While cross-sectional studies can be less expensive and quicker to execute, they do not provide the sequential data over time that longitudinal research can offer.
Why do you think that the first thing you learn about in a Biology course is Chemistry? How does learning chemistry apply to Biology?
Final answer:
The fundamental principles of chemistry are critical for understanding biological processes. The composition and reactions of chemicals form the basis of all life, and this knowledge is requisite for grasping the complexity of biology, which is why it is taught first in Biology courses.
Explanation:
One might wonder why the first thing you learn in a Biology course is Chemistry. The reason is that chemistry forms the fundamental basis for understanding the biological processes that occur in all living organisms. Our cells consist of thousands of chemicals, involving elements such as carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur. These chemicals combine through chemical reactions to form the building blocks of life. Additionally, the products we use daily, our food preparation methods, and even how our bodies function, involve chemistry at a fundamental level.
In a Biology course, understanding the chemical foundation of life allows students to grasp complex biological processes. For instance, studying the atomic structure of molecules helps in understanding how proteins and nucleic acids work. Similarly, knowledge of how different forms of matter combine is pivotal in areas such as the synthesis and design of drugs—a key aspect of medicine.
The resurrection fern (Pleopeltis polypodioides) grows on the bark of southern live oak trees (Quercus virginiana). Resurrection ferns that grow on the underside of branches receive less water than those growing on the topside and, therefore, have a fitness of only 0.28. How many of these ferns will be non-reproducing?
Select one:
a. 52%
b. 72%
c. 80%
d. 28%
Answer:
Option B
Explanation:
In biology, fitness refers to the ability of an organism to survive, reproduce, mate and support evolution through gene transfer. A fitness of 0.28 signifies that only 28 percent of a given population are fit physically and able to reproduce while the remaining 72 % are unable to mate and hence cannot reproduce and contribute towards gene flow and evolution.
Hence, option B is correct
If a compound has a number of individual dipoles, then: I. It is polar overall. II. There is an electronegativity difference between the bonded atoms. III. it is ionic. IV. It doesn't have resonance.
Answer:
II. There is an electronegativity difference between the bonded atoms.
Explanation:
In a compound that has a number of individual dipoles(weaker force of attractions between compounds). There exist a weaker intermolecular force of attraction ( Vander waal's forces), these force of attraction arises from fluctuating dipoles in atom molecules brought by the movement of electrons around the atomic nucleus. They possess weak electronegativity difference between the bonded atoms because they have less energy to break these weaker bonds.
Also, individual dipoles can interact with each other in an way which will also increase the boiling point and as boiling point increases there is decrease in electronegativity difference between the bonded atoms.
On the other-hand, A polar compound are ionic compounds and the bonding between them are electrovalent bonding because of their high melting and boiling points. They possess high electronegativity.
Individuals III-3 and III-4 are expecting their first child when they become aware that they both have a family history of this recessive condition. As their genetic counselor, you can calculate the probability that they are carriers and that their child will be affected with the condition.1.) The probability that III- 3 is a carrier (Rr) =2.) The probability that III - 4 is a carrier (Rr) =3.) The probability that IV - 1 will be affected (rr) =Options are 1/4, 1/2, 1/16, 1/3, 3/4, 2/3, 1/12, 1/6
Pedigree attached
Answer:
1) 2/3
2) 1/2
3) 1/12
Explanation:
1) Individual III.1 is affected. He inherited one r allele from his carrier mother, but must also have inherited another allele from his father, who's genotype we are not told. His father is unaffected, but because III.1 is affected, must be a carrier with the genotype Rr. Therefore, the parents of III.3 have are Rr x Rr. We can carry out a punnett square to assess probabilities
R r
R RR Rr
r Rr rr
The probability of him inheriting an r from either parent is 1/2 (as there is 50% chance of being Rr in the punnet square). However, we already know that he is not rr (he is unaffected and has a R allele), so that means 2/3 of the options involve him being a carrier
2) The probability III.4 is a carrier can be calculated because we have the genotypes of her parents, RR x Rr
R R
R RR RR
r Rr Rr
The probability III.4 is a carrier is 1/2 but with no possibility that she is affected.
3) If both parents were carriers, there would be a 1/4 chance that individual IV.1 would be affected, see punnet square below:
R r
R RR Rr
r Rr rr
Only rr genotype is affected, so the probability is 1:4. However, there is only 1/2 probability that their mother is affected and 1/2 that their father is. To work out their probability based on this we have to multiply the probabilities: 2/3 x 1/2 x 1/4 = 1/12
The probabilities that the parents III-3 and III-4 are carriers of a recessive genetic trait are both 1/2, while the probability of their child inheriting the condition is 1/4.
Explanation:This question is asking about the probability of individuals III-3 and III-4 being carriers of a recessive genetic condition and the probability of their child being affected. Since we're dealing with a recessive genetic trait, if both parents are heterozygous carriers (Rr), the chance that any one of their children will be a carrier is 50% or 1/2. This applies to the probabilities that III-3 and III-4 are carriers. The chance that their child IV-1 will be affected (rr) is 1/4, as in classical Mendelian inheritance, when both parents are heterozygous carriers, there is a 25% chance for the child to inherit two recessive alleles.
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A diploid organism has a somatic chromosome number of 16. The centromeres of the 8 homologous pairs are designated as Aa, Bb, Cc, Dd, Ee, Ff, Gg and Hh, with uppercase letters referring to the centromeres of maternal chromosomes and lowercase letters to the centromeres of paternal chromosomes. Each centromere represents one chromosome. Where n = the haploid chromosome number. How many different combinations of centromeres could be produced during meiosis?
a.) 8
b.) 64
c.) 256
d.) 512
e.) 6561
Answer:
Option C, [tex]256[/tex]
Explanation:
The diploid number of chromosomes are represented as [tex]2N[/tex].
Here the somatic chromosome number is [tex]16[/tex] which can be represented in the "[tex]2N[/tex]" format with N being equal to [tex]8[/tex].
Now, as we know that the total number of chromosomal combination with chromosome number being
[tex]16 \\OR\\2 N(8)[/tex]
is equal to
[tex]2^N\\[/tex]
Substituting the given values in above equation, we get -
[tex]2^8\\= 256\\[/tex]
Therefore, total of [tex]256[/tex] different combinations of centro-meres could be produced during meiosis.
Hence, option C is correct
The solutions listed below are in two arms of a tube separated by a semipermeable membrane. The solution in the left arm is given first. In which case the osmotic flow proceeds from the right to the left arm? Group of answer choices
0.010 M NH3(aq) |
0.010 M NaCl(aq)
0.010 M NaCl(aq) |
0.010 M FeCl3(aq)
0.010 M NaCl(aq) |
0.010 M CH3COOH(aq)
0.010 M NaCl(aq) |
0.010 M CaCl2(aq)
0.010 M CaCl2(aq) |
0.010 M FeCl3(aq)
Answer:
The correct answer is the couple: 0.010 M NaCl | 0.010 M CH₃COOH
Explanation:
A semipermeable membrane allows to pass through solvent molecules but not solute molecules. In this case, all solutions have the same molarity (M) but they do not have the same quantity of solute particles because some of them dissociate in two or more ions (van't Hoff factor i is higher than 1) . Osmotic flow proceeds always from the side with lower concentration of solute (with more solvent molecules) to the side with higher concentration of solute. For each pair of solution, we have to determine the number of particles of solute or the van't Hoff factor (i). If the right side has the lower concentration of solute (higher i), the osmotic flow will proceed from the right to the left.
0.010 M NH3(aq) | 0.010 M NaCl(aq): NH₃ is a nonelectrolyte (i=1) and NaCl has i= 2. Osmotic flow proceeds from left to the right.
0.010 M NaCl(aq) | 0.010 M FeCl3(aq): NaCl has i=2 and FeCl₃ has i=3 (it dissociates in Fe⁺ and 3 Cl⁻). Osmotic flow proceeds from left to the right.
0.010 M NaCl(aq) | 0.010 M CH3COOH(aq): NaCl has i=2 and CH₃COOH is a nonelectrolyte (i=1). The lower concentration is in the right side, so the osmotic flow proceeds from right to left.
0.010 M NaCl(aq) | 0.010 M CaCl2(aq): NaCl has i=2 and CaCl₂ has i=3 (it dissociates in Ca⁺ and 2 Cl⁻). The lower concentration is in the left side so the osmotic flow proceeds from left to right.
0.010 M CaCl2(aq) | 0.010 M FeCl3(aq): CaCl₂ has i=3 and FaCl₃ has i=4 (it dissociates in Fe⁺ and 3 Cl⁻), so the lower concentration is in the left side and osmotic flow proceeds from left to right.
In the given case, the osmotic flow proceeds from the right to the left arm - 0.010 M NaCl(aq) | 0.010 M CH3COOH(aq)
Osmotic flowIt is the spontaneous flow of molecules of the solvent through a semipermeable membrane. The flow would be for the zone of high concentration in order to achieve equal concentration on both sides.
Since we have to apply the pressure on the left arm of the tube to stop osmosis. It indicates that the solution in the left arm is hypertonic to the one in the right arm of the tube.
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If an organism has a recessive phenotype for a trait following simple Mendelian inheritance: ________-
Answer:
If an organism has a recessive phenotype for a trait following simple Mendelian inheritance, there is only one possible genotype that can be attributed to them. For example green eyes (C) is dominant over grey eyes (c). If an organism has blue eyes, the only possible genotypic combination is (cc), as there cannot be any presence of the dominant gene.
Final answer:
If an organism has a recessive phenotype for a trait following simple Mendelian inheritance: it means that the organism's genotype contains two recessive alleles, also known as being homozygous recessive.
Explanation:
An organism with at least one dominant allele will have the phenotype of the dominant allele, meaning that the recessive trait will only be exhibited when both alleles for the trait are recessive. This is consistent with Mendel's law of segregation, which states that allele pairs segregate during gamete formation and randomly recombine during fertilization.
In practical terms, if both parents are carriers of a recessive trait, there is a 25% chance for each child to express the recessive trait.
This can be demonstrated with a test cross, where an organism with a dominant phenotype (if heterozygous) is crossed with an organism that is homozygous recessive, potentially resulting in a 1:1 ratio of the offspring displaying the dominant to recessive phenotype.
1. Explain why the communication skills and techniques used within a business unit (department) are not always effective in communicating across business units or up and down the corporate ladder.
Answer:
Communication can be complicated in any organization. This is due to the fact that discussing peer to peer in a corporate office, of the institution, is going to be a lot unlike discussing peer to peer in a low-level office setting.
Also, cultural diversity can take a form in how efficient communication is. It is also very important that varying forms of communication are employed. Businesses that consists of many varying departments won't be dependent wholly on face to face communication. Therefore, it is necessary to have other forms of communication being utilized often. Examples of such Forms: email, phone, radio, etc.
In order to establish an effective route of communication that each sector of the organization feeds from, skilled communication professionals is necessary to be placed at every sector or place of business. This will permit corporate to possess “eyes on the target” per say. In other words, they can possess actual people all through every department or unit that can convey messages back and forth. International seems to do a good job at this. Their communications directors are involved with the relay of messages, permitting corporate’s suggestions which is then tailored to fit their particular department
A colony of bacteria originally contains 200 bacteria. It doubles in size every 30 minutes. How many hours will it take for the colony to contain 2,000 bacteria? (Round your answer to one decimal place.
Answer: It will take 1.7 hours. If it isn't correct then please feel free to delete this. If it is however please mark me brainliest. Thanks!
Suppose that two parents are both heterozygous for sickle cell anemia, which is an autosomal recessive disease. They have seven children. Use the binomial theorem to determine the probability that three of the children have sickle cell anemia and four of the children are healthy. Round your answer to the nearest hundredth.
Huntington\'s disease is an inherited autosomal dominant disorder that can affect both men and women. Imagine a couple has had seven children, and later in life, the husband develops Huntington\'s disease. He is tested and it is discovered he is heterozygous for the disease allele, Hh. The wife is also genetically tested for the Huntington\'s disease allele, and her test results show she is unaffected, hh. What is the percent probability that the first child of this couple will have Huntington\'s disease?also..
What is the probability that any two of the seven children will have Huntington\'s disease?
Answer:
Part A
[tex]0.108[/tex]
Part B
B.1
Fifty Percent
B.2
[tex]16.4[/tex] %
Explanation:
Part A
Given -
Both the parents are heterozygous for the sickle cell anemia
Let the genotype of the parents be
Ss
where S is the allele for presence of sickle cell anemia
and s is the allele absence of sickle cell anemia
If the above two parents are crossed, following offspring are produced
Ss * Ss
SS, Ss, Ss, ss
The probability of children with sickle cell anemia is equal to
[tex]\frac{3}{4}[/tex]
The probability of children with sickle cell anemia is equal to
[tex]\frac{1}{4}[/tex]
Probability that three of the children have sickle cell anemia and four of the children are healthy
[tex]\frac{7!}{3! * 4!} * \frac{3}{4}^4 * \frac{1}{4}^3\\ = 35 * \frac{81}{256 *64} \\= 0.108[/tex]
Part B
B.1
Hh * hh
Hh, Hh, hh, hh
The first child of the parent has a probability of fifty percent to have Huntington\'s disease
B.2
[tex]\frac{7!}{2!*5!} * \frac{1}{2}^2 * \frac{1}{2}^5[/tex]
[tex]= 16.4[/tex]
"Consumers do not typically perform an LCA before making a purchase, though they might use the results from an LCA that have been summarized on a label or on a company's website.____________-
Answer:TRUE
Explanation:LCA(LIFE CYCLE ASSESSMENT) is a system through the life cycle or shelf life of a product is assessed,it is usually done by regulatory bodies,the manufacturers of the product to enhance the knowledge and know the possible duration of use of a give product.
Life cycle assessment helps to value a product as it helps to determine the pricing of the product or services by the consumers. The higher the life cycle the better the pricing.
The DNA changes that are described in Henry’s story are changes to the coding strands of the CYP2C9 genes. What is the function of the coding strand and how does it differ from the function of the template strand of Henry’s CYP2C9 gene?
Answer: the coding strand of Henry CYP2C9 aids in the determination of the precise/correct nucleotide sequence of the RNA strand produced after transcription
Explanation: The template strand functions in the production of the RNA strand during transcription ie the RNA strand is complementary to the template strand. RNA produced runs from the 5' to 3' direction. The coding strand differs from the template strand in that it is the strand that contains the exact nucleotide sequence as the RNA strand but differs in that the RNA is replaced with uracil instead of thymine and it also runs in the 5' to 3' direction.
Final answer:
The coding strand of DNA is the sequence that corresponds to the mRNA sequence produced during transcription, while the template strand is the actual template used by RNA polymerase to synthesize mRNA.
Explanation:
The function of the coding strand of DNA is to serve as the basis for the mRNA sequence during transcription, albeit indirectly. The coding strand has the same sequence as the mRNA, with the only difference being that thymine (T) bases in DNA are replaced by uracil (U) in RNA.
On the other hand, the template strand, also known as the non-coding strand, is the direct template for mRNA synthesis.
RNA polymerase uses this template strand to align and add the appropriate RNA nucleotides to form a new mRNA strand that is complementary to the template strand and matches the coding strand (except for T being replaced by U).
You have some circular DNA in a tube and wish to introduce negative supercoils into it. However, you ran out of topoisomerase. Can you think of a way to do this usingDNA ligase and ethidium bromide
Answer:
First the DNA ligase will join the DNA together.
Secondly, ethidium bromide is added to generate circles after then it is extracted.
After these are done, the DNA becomes negatively supercoiled since
Tw + Wr =constant.
Tw = twist
Wr = writhe
One of your classmates has symptoms of protein deficiency. You suspect that she might have a mineral deficiency due to her diet of nothing but canned spaghetti. Which of the following minerals should you test for first?
A. IronB. CopperC. ManganeseD. MolybdenumE. Sulfur
Answer:
Sulphur, because it is the major building element for protein synthesis.
Explanation:
A diet of only canned spaghetti has no Sulphur contents ( the only mineral in spaghetti is iron( 4mg ). But most enriched canned spaghetti contains 4g protein. However the sulphur in this protein would have been broken down during heat processing and packaging to sulphides(picked up by sulphur resistant enamel in the can). Therefore she has been on no protein diet but just on purely carbohydrate diet, hence protein deficiency.
Consequently,her body sulphur content is very low. Sulphur is the major content of some amino acids in the body of animals; especially in formation of methionine and Cysteine structures.
The sulphur content of Cysteine residues provides disulphide bridges(S-S) in polypeptide chains which is important for assemblage,storage and stability (as covalent bonds) of protein structure needed for protein synthesis. In addition, Methionine is an essential amino acid, needed in protein synthesis,
Thus lack of sulphur results in lack of methionine and cystenine and therefore ,deficiency of protein .
.
Proteins A, B and C bind to each other to form a complex, ABC. Under equilibrium the concentrations of A, B, C and ABC are 10-2 M. The equilibrium constant and the standard free energy of this association reaction at T=300 K are, respectively,
a) 10-6 M2 and -8.3 kcal/mol.
b) 10-4 M2 and -5.5 kcal/mol.
c) 10-3 M2 and -4.1 kcal/mol.
d) 10-2 M2 and -2.8 kcal/mol.
e) 10-1 M2 and -1.4 kcal/mol.
Answer: b) [tex]10^{4}M2[/tex] and [tex]-5.5 kcal/mol[/tex]
Explanation:
Equilibrium concentration of [tex]A[/tex] = [tex]10^{-2}M[/tex]
Equilibrium concentration of [tex]B[/tex] = [tex]10^{-2}M[/tex]
Equilibrium concentration of [tex]C[/tex] = [tex]10^{-2}M[/tex]
Equilibrium concentration of [tex]ABC[/tex] = [tex]10^{-2}M[/tex]
The given balanced equilibrium reaction is,
[tex]A+B+C\rightleftharpoons ABC[/tex]
The expression for equilibrium constant for this reaction will be,
[tex]K_c=\frac{[ABC]}{[A][B][C]}[/tex]
Now put all the given values in this expression, we get :
[tex]K_c=\frac{10^{-2}}{(10^{-2})^3}[/tex]
[tex]K_c=10^4M^2[/tex]
[tex]\Delta G^o=-2.303\times RT\times \log K_c[/tex]
where,
R = universal gas constant = 2 cal/K/mole
T = temperature = 300 K
[tex]K_c[/tex] = equilibrium constant = [tex]10^4[/tex]
[tex]\Delta G^o=-2.303\times 2\times 300\times \log (10^4)[/tex]
[tex]\Delta G^o=-5527.2cal/mol=-5.5kcal/mol[/tex]
Thus the equilibrium constant and the standard free energy of this association reaction at T=300 K are [tex]10^4M^2[/tex] and [tex]-5.5kcal/mol[/tex]
Suppose that an arginine residue in the active site of an enzyme was mutated to alanine. As expected, the alanine mutant was inactive, suggesting that the arginine residue was critical to the catalytic mechanism. Which mutation is most likely to restore wild‑type level of activity to the alanine mutant?
Answer Options:O A to EO A to KO A to SO A to MO A to Y
Answer:
O. A to K
Explanation:
Arginine (R) is a positively charged basic amino acid and alanine (A) is a hydrophobic amino acid. Arginine is mostly found on surface of protein to produce hydrogen bonds or other ionic combinations so as to provide stability to the protein or control the activity of the protein. Alanine on the other hand, is hydrophobic. Thus, when arginine is replaced with alanine the catalytic ability of the enzyme are affected.
Lysine (K) is known to be a positively charged basic amino acid like arginine. Therefore, mutating alanine to lysine will confer the chemical abilities of the protein as a result of similarity in chemical attributes of arginine and lysine, which will confer the wild type characters of the enzyme.
What is the significance of the fact that there are air molecules in a medium?
Answer:
The molecules in the air can be displaced by a force creating sound waves. Vibrations generally travel faster in a solid compartment than as in gases.
Which of the following is an example of an abiotic factor?A.the number of individuals of a particular species living in a communityB.the interactions between different species in a communityC.the diversity of prey and predator species in a communityD.the climate of the community in which the species mentioned above inhabit
Answer: Option D) the climate of the community in which the species mentioned above inhabit
Explanation:
Abiotic refers to non-living factors. Thus, the abiotic factors in an habitat where living organisms dwells include the atmospheric conditions such as climate, weather; inorganic nutrients such as phosphorus, carbon compounds, water etc present in the soil of such habitat.
Thus, Option D represent the abiotic factor
Without a plateau extending the refractory period in cardiac muscles sarcomeres might be stimulated so quickly that they would contract and not relax and instead would experience a sustained contraction also called:
1) depolarization
2) Tetany
3) relaxation
4) repolarization
Answer:
Tetany
Explanation
The refractory period in the heart refers to the shortest interval between consecutive contraction conducted impulses out of the cardiac muscle.
It is important because it allows adjustments to stimuli and limits amount of action potential sent per minute.
Without a plateau extending the refractory period in the cardiac muscles.
Sarcomeres might be stimulated to contract instead of relaxing leading to sustained contraction also called Tetany.
Tetany is an involuntary muscle cramp or contraction caused by overly stimulated nerves.
If a woman and her husband, who are both carriers, have three children, what is the probability that all three children have the normal phenotype? Express your answer as a fraction using the slash symbol and no spaces (for example, 1/16)
Answer: 1/64 would be normal
Explanation:
Let the woman phenotype be Yy, since a carrier is usually heterozygous;
Also let the husband phenotype be Yy
Then Yy seperate to yield two alleles "Y" and "y"
So, the cross of the two alleles:
"Y", "y" X "Y", "y"
F1 will be YY, Yy, Yy and yy
From the crossing,
- the normal phenotype are YY,
-the carriers are Yy, Yy
- while yy is recessive.
Since, the probability that one of their offspring is normal is 1/4; for three children, then 1/4 x 1/4 x 1/4 = 1/64
Thus, probability that all three children are normal is 1/64
Below is the DNA strand template for making an mRNA needed to produce a small peptide. a.) Transcribe the sequence into mRNA. (0.5 pt.) b.) Translate the mRNA sequence into protein. (0.5 pt.) c.) Transcribe the mRNA and translate into protein with a mutant sequence that has a transition at position 11. What type of mutation does this cause
Answer:
a) mRNA: AUG ACC GGC AAU CAA CUA UAU UGA
b) Protein: Methionine, Threonine, Glycine, Asparagine, Glutamine, Leucine, Tyrosine, Stop.
Explanation:
The Question was missing the DNA Strand. I have looked up the question and found this to be the DNA strand related to this question. A picture for converting codons to amino acids is also attached. A protein is simply a strand of Amino Acids.
DNA (3 to 5 sequence):
TAC TGG CCG TTA GTT GAT ATA ACT
a). Transcribing to mRNA (5 to 3 sequence):
AUG ACC GGC AAU CAA CUA UAU UGA
b). Related Amino Acids:
1st Codon: Methionine
2nd Codon: Threonine
3rd Codon: Glycine
4th Codon: Asparagine
5th Codon: Glutamine
6th Codon: Leucine
7th Codon: Tyrosine
8th Codon: Stop Codon
c.) DNA with Transition Mutation at Position 11 (5 to 3 sequence):
In genetics, Transition is a point mutation which converts a purine nucleotide to another i.e. A ↔ G, or a pyrimidine nucleotide to another pyrimidine i.e. C ↔ T. Hence, after transition at 11 position, T will be changed to C.
TAC TGG CCG TCA GTT GAT ATA ACT
Transcribing to mRNA (5 to 3 sequence):
AUG ACC GGC AGU CAA CUA UAU UGA
Related Amino Acids:
1st Codon: Methionine
2nd Codon: Threonine
3rd Codon: Glycine
4th Codon: Serine
5th Codon: Glutamine
6th Codon: Leucine
7th Codon: Tyrosine
8th Codon: Stop Codon
Which of the following is NOT true regarding the sounds associated with the heart? Select one: a. The "lub-dub" sound originates from the physical act of the heart contracting. b. The "lub-dub" sound originates from blood turbulence through the heart.
The 'lub-dub' sound we hear is the sound of the heart valves closing, not the contraction of the heart muscle. The 'lub' is the sound of the mitral and tricuspid valves closing, while the 'dub' is the sound of the aortic and pulmonic valves closing.
Explanation:The statement 'a. The "lub-dub" sound originates from the physical act of the heart contracting' is NOT true regarding the sounds associated with the heart. The "lub-dub" sound we hear is actually made by the closing of heart valves, not the contractions of the heart muscle itself. Specifically, the "lub" is the sound of the mitral and tricuspid valves closing at the beginning of systole (an active phase when your heart pumps blood), while the "dub" is the sound of the aortic and pulmonic valves closing at the beginning of diastole (a resting phase when your heart fills with blood).
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Final answer:
The incorrect statement is that b. the "lub-dub" sound originates from blood turbulence through the heart. These sounds are actually the result of the closing of the AV valves (for "lub") and the semilunar valves (for "dub"), which can be heard with a stethoscope.
Explanation:
The question is asking which statement is NOT true about the origins of the heart sounds. The answer to this is b, "The "lub-dub" sound originates from blood turbulence through the heart." It is not correct because the "lub-dub" sounds, known medically as S1 and S2, are primarily caused by the closing of the heart valves, not by blood turbulence.
The "lub" or the first heart sound, S1, occurs when the atrioventricular (AV) valves close at the beginning of ventricular systole, while the "dub" or the second heart sound, S2, happens when the semilunar (SL) valves close at the end of ventricular systole. When a medical practitioner uses a stethoscope to listen to the heart, these sounds provide critical information regarding the heart's condition.
why is reproduction considered as a life function?
Answer:
why is reproduction considered as a life function?
Reproduction is considered as life function because it enable life continuity as a result of the new generation brought to life. Inheritable characteristics are being passed from one generation to another as a result of reproduction.
Explanation:
Without reproduction, there would not be life continuity, life would have end without it as no character would have been inheritable
Answer: Reproduction is considered as life function because it is important for living things survival and without it life will come to an end. Reproduction lead to life continuity and multiplication of living organisms. A particular organism can reproduce to produce offsprings,offsprings reproduce to produce offsprings and it continues like that. Reproduction lead to life continuity and prevention of extinction of species.
Explanation:
Reproduction is the process whereby offsprings are generated or produced from parents. Reproduction can either be sexual or asexual reproduction. In sexual reproduction, two gametes are involved and fuse to form offsprings.
In asexual reproduction, a single parent cell can replicate itself. Reproduction is a life function because without it, there will be extinction or species and life will come to an end.
According to existing research, chimpanzees Select one: a. do not use tools. b. have complex grooming and courtship behaviors. c. cannot solve technical problems. d. All of the choices are correct.
Answer:
option b. have complex grooming and courtship behaviors is correct answer.
Explanation:
According to a research paper published in American journal of primatology provided evidences that chimpanzee males, as promiscuous breeders with minimal costs to mating, should show little or no preference when choosing mating partners (e.g. should mate indiscriminately).
Reference: Proctor, D. P., Lambeth, S. P., Schapiro, S. J., & Brosnan, S. F. (2011). Male chimpanzees' grooming rates vary by female age, parity, and fertility status. American journal of primatology, 73(10), 989–996. doi:10.1002/ajp.20964
The field of genetics has demonstrated that both molecular and transmission genetics characterize the same hereditary processes at different levels. For example, the wrinkled seed phenotype used by Mendel results from a defect in the gene that encodes which of the following products?
(A) gibberellin 3-[beta] hydroxylase, an enzyme required for synthesis of the growth factor gibberellin
(B) an enzyme that catalyzes a step in the breakdown of chlorophyll
(C) a transcription factor that activates the expression of genes required for anthocyanin production
(D) starch-branching enzyme
Answer:
The wrinkled seed phenotype used by Mendel results from starch branching enzyme.
Explanation:
During mono hybrid cross, Mendel took 2 types of pea plant of which one was tall (TT) and another pea plant was (tt). After crossing, he observed that in F1 generation the ratio of tall and dwarf plant was 3:1
He observed that there is a particular enzyme which causes formation of dwarf plant as the enzyme is absent in wrinkle offspring but present in the round offspring,The enzyme is called as starch branching enzyme.
Thus failure in the formation of this enzyme produce complex metabolic consequences on starch, protein and lipid biosynthesis.
when DNA mutations occur they can have a variety of effects on an organism if the DNA is TAC CGA ACC TTA create a mRNA strand with a point mutation that would shorten the protein
Final answer:
A nonsense mutation in the mRNA sequence can introduce a stop codon, prematurely ending the translation process and therefore shortening the protein. The mutated mRNA sequence for the given DNA would have a point mutation turning the second codon into a stop codon, thus producing a truncated and likely non-functional protein.
Explanation:
To induce a point mutation that shortens the protein, you would create a nonsense mutation in the mRNA sequence. For the original DNA sequence TAC CGA ACC TTA, the corresponding mRNA sequence is AUG GCU UGG AAU. If we introduce a point mutation in the second codon to change it to a stop codon, we can use the stop codon UAA. The mutated mRNA sequence would be AUG UAA UGG AAU. Here, UAA is a stop codon and will cause the translation process to terminate prematurely, therefore shortening the resulting protein.
Nonsense mutations convert a codon that can specify an amino acid into a stop codon (UAA, UAG, UGA), leading to premature termination of translation. This type of mutation can have a profound effect on the protein, as it will be truncated, likely destroying its normal function. This is because the ribosome will cease to translate the mRNA into protein upon reaching the stop codon, resulting in an incomplete and non-functional protein product.
Mutations can profoundly impact an organism by altering its proteins. Depending on where the mutation occurs, the consequences may be mild or severe. Inducing such mutations intentionally can be a valuable tool for research but can be detrimental when they occur naturally and disrupt the organism's biological functions.
________ produced by microbial fermentation of glucose from cellulose or cornstarch is becoming a more important component of biofuels in the United States, and specialized ________ are needed to make this a commercially available product. A) Biodiesel / biotechnologists B) Biodiesel / industrial microbiologists C) Ethanol / biotechnologists D) Ethanol / industrial microbiologists
Answer:
The correct answer is option D) "Ethanol / industrial microbiologists".
Explanation:
Ethanol is one of the most common components of biofuels in the United States. Ethanol is used in biofuels for its property of producing oxygen when burned, which makes car's engine to burn fuel more efficiently. Ethanol is produced by microbial fermentation of glucose from cellulose or cornstarch, and industrial microbiologists are the professionals responsible of making this product commercially available.
Answer:
D) Ethanol / industrial microbiologists
Explanation:
In this case of bio-fuels we have already prepared bio ethanol that is being produced after a process called as fermentation run by utilization of specially designed strains of micro-organisms. This simple fermentation is on a small scale and is not feasible for let say the whole country. Now, the industrial microbiologists are the only expert people that shall advance in some kind of already present hyper fermentation techniques that'll eventually give us enough quantity of ethanol to be used commercially.
In muscles, ATP is generated by glycolysis from two sources of glucose. One source is glucose that is broken down from glycogen stored in the muscles, and the other is from glucose that is taken up from the blood. Which of the following statements is true? A) A net 3 ATPs are generated per glucose from glycogen instead of a net of 2 ATPs from glucose taken up from the blood B) a net 2 ATPs are always generated per glucose regardless of its source C) glycogen is broken-down into UDP-glucose D) glucose only comes from glycogen α(1,4) links and not α(1,6) branches E) none of the above
Answer:
The answer is B a net 2 ATPs are always generated per glucose regardless of its source
Explanation
Glycogen breaks down in the muscle so as to have enough glucose for muscle contraction and it produces 2ATPs
Glycogen also breaks down in the liver to release enough glucose which gets to the blood stream and is then taken up by other cells. It also produces 2ATPs at the expense of 6ATPs
20. Which of the following statements is/are correct?
A. Molluscs can live in marine, and freshwater habitats but do not live in terrestrial habitats.
B. Given the following on the organism:
I. An animal
II. Multicellular
III. has tissues
IV. has a digestive tract
V. exhibits bilaterally symmetry as an adult
This organism could be a member of the Phylum Mollusca
C. Molluscs can produce a shell and the presence of a shell at one point in development is a requirement for inclusion into this phylum.
D. Lobsters are members of the phylum Mollusca
E. Molluscs have three main body parts, a muscular foot, a visceral mass, and a head
Answer: Option C and E are correct.
Explanation:
Phylum molluscs are invertebrates species. They are the second largest phylum in the animal kingdom .Most mollusc live in marine and others live in freshwater and terrestrial habitat. Molluscs are ceoomates and they have three universal structures which are the mantle (breathing and excretion),radula and nervous system. The molluscs include snail, oyster,clams, periwinkles,octopus, squid e.t.c.
The larvae of molluscs are bilateral symmetrical while the adults are asymmetrical. Molluscs can produce shell, the presence of shell is an inclusion in the phylum.
Molluscs have three body part, the head, visceral mass and muscular foot
Answer: Options B and E are correct
Explanation: molluscs are found in freshwater, marine and terrestrial habitat. Some small species such as the land snail lives in dampy and dark places in terrestrial habitats. Molluscs are animal, are multicellular, have tissue, a digestive tract which includes mouth, stomach, anus and they also possess an oral structure called the radula. Some cephalopods do not have shells as they have lost their shells at one point in evolution and examples include octopuses. Lobsters are crustaceans belonging to the phylum arthropoda. Molluscs do have three main body parts head, visceral mass and the muscular foot.
NC State is a community that is strong because of the diversity of our perspectives and experiences. Please describe how you could contribute to or benefit from campus diversity.
Answer:
One thing that I can contribute to the NC State Community campus diversity is my culture and my background.
I’m a first-generation American born Nigerian. My parents are from Nigeria and relocated to America some years before I was born. This as lead to basically two influences in my life, the influence of the Nigerian culture from my parents and my community, and the influence of the U.S. culture.
Basically, these are the two influences in my life, I had to mix the varying unique ways to living into one and take good advantage of life out of both worlds.
At majority of the time, my beliefs align with the beliefs of a typical Nigerian but at other times I see myself conflicted due to the varying or separate backgrounds.
I believe in living a day at a time and to enjoy the present moment so as to get the best from both backgrounds which has structured me into the person I am today.
Contributing to or benefiting from campus diversity at NC State involves actively engaging with different perspectives and experiences to enrich the community and prepare for a globally diverse workforce. This includes sharing personal experiences, supporting inclusivity efforts, and developing an understanding and empathy toward diverse backgrounds.
Explanation:Contributing to or benefiting from campus diversity at NC State involves understanding and engaging with the multitude of perspectives and experiences present within the community. Embracing diversity means more than just acknowledging different demographic backgrounds; it involves actively participating in a community that appreciates and learns from these differences. Adding to this diversity could mean sharing personal experiences and perspectives that are less represented on campus, thereby enriching the academic and social environment for everyone. It could also involve engaging with and supporting efforts that aim to make the campus a more inclusive space, such as partnering with the Diversity Office or participating in events that celebrate different cultures and identities.
From benefiting from campus diversity, one can gain a broader understanding of the world, develop greater empathy and communication skills, and prepare for a global workforce that values diversity and inclusivity. In turn, contributions to diversity can take many forms, such as advocating for greater representation within the university, contributing to the creation of more inclusive curricula, or simply being an active and empathetic participant in conversations about diversity and inclusion.