A population that is isolated in a remote environment is still able to experience genetic variation How could genetic variation that contributes to evolution occur in such a population

Answer:

Every cell present in an organism has the ability to develop into a specialized type of cell. Specialized cells perform specialized functions.

All  the cells of the body have the same DNA and the same number of chromosomes ( except sex cells). Yet, each cell is specialized to perform a different function because each cell has a different gene expression. The genes which are activated in one cell type might not be activated in the other cell type.

Answer:

Gymnosperms

Explanation:

Conifers have cones which hold their seeds. They don't produce fruits or flowers.

The given statement is false.

The statement "False" indicates that the Greenhouse Effect is not inherently terrible for the planet Earth and its environments. While the natural Greenhouse Effect is essential for maintaining a habitable temperature on Earth by trapping some of the sun's heat, concerns arise due to human activities contributing to an enhanced Greenhouse Effect.

Human-induced emissions, particularly of greenhouse gases like carbon dioxide, methane, and nitrous oxide, intensify the natural warming effect. This anthropogenic impact leads to global warming and climate change, causing adverse effects on ecosystems, weather patterns, and sea levels. Thus, it is the intensified, human-driven Greenhouse Effect that poses environmental challenges rather than the natural Greenhouse Effect itself. Hence ,the given statement is false.

Complete question:

The Greenhouse Effect is terrible for the planet Earth and the environments contained here.

True

False

Answer:

5

Explanation:

Pepsin works best in acidic conditions at pH of 2 and trypsin in alkaline conditions. A pH of 5 is best for the enzymes since it is less acidic and alkaline. However, the activity of both enzymes would be lower than expected.

Final answer:

The optimal pH for equal catalyzing rates of pepsin and trypsin enzymes is pH 8. Thus, option D is correct.

Explanation:

The pH at which the activity of both pepsin and trypsin enzymes have the same catalyzing rate is pH 8.

Both enzymes have different optimal pH levels due to the different environments they work in - pepsin in the highly acidic stomach environment with an optimum pH of about 1.5, and trypsin in the small intestine with an optimum pH of about 8.

Therefore, at pH 8, trypsin would have its optimal activity level while pepsin would also exhibit activity at this pH.

Answer:

C.

Explanation:

In mRNA, there isn't a Thymine nitrogen base. There is a "new" nitrogen base called Uracil, which takes its place. So in transcription, A=U and C=G.

In mRNA, there isn't a Thymine nitrogen base. There is a "new" nitrogen base called Uracil, which takes its place. So in transcription, A=U and C=G.

Messenger RNA (mRNA) is a single-stranded RNA molecule that is complementary to one of the DNA strands of a gene. The mRNA is an RNA version of the gene that leaves the cell nucleus and moves to the cytoplasm where proteins are made.

Thus, option "C" is correct.

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All the 10 offsprings have recessive smooth coats because all the progeny are formed by recessive r allele and resulted is smooth coat. It was because one of the parents was heterozygous.

Explanation:

Rough coat R is dominant over the allele for smooth coat r

Heterozygous guinea pig Rr is crossed with homozygous recessive guinea pig rr

So from the Punette square

      r     r

R  Rr    Rr

r   rr    rr

There are chances of occurrence of 50 % each of heterozygous rough and dominant recessive smooth coats.

From the result obtained in actual, all the offspring have smooth coats because all of these offsprings have receive recessive allele from their parent and have become homozygous recessive.

Inheritance of smooth coats in all offspring from a heterozygous (Rr) and homozygous recessive (rr) guinea pig mating is due to each offspring inheriting the recessive 'r' allele from both parents, which is statistically improbable but possible.

In guinea pigs, the allele for a rough coat (R) is dominant over the allele for a smooth coat (r). When a heterozygous guinea pig (Rr) reproduces with a homozygous recessive guinea pig (rr), their offspring can inherit one allele from each parent. The offspring could either be heterozygous (Rr) with a rough coat or homozygous recessive (rr) with a smooth coat. If all 10 offspring have smooth coats, it is likely because each offspring randomly received the recessive 'r' allele from the heterozygous parent and the recessive 'r' allele from the homozygous recessive parent, resulting in a genotype of rr, which expresses the smooth coat phenotype.

A heterozygous individual has a 50/50 chance of passing on the dominant or recessive allele. In this case, all offspring receiving the 'r' allele from the heterozygous parent would have smooth coats, as the 'rr' genotype expresses the recessive phenotype. However, it is statistically improbable for all offspring to inherit the same allele unless other factors are influencing inheritance or a very small sample size creates a misleading result.

Answer:

The answer is A

Explanation:

Answer: The combination of phosphate, sugar, and nitrogen bases in DNA or RNA is called a nucleotide.

Explanation: Nucleotides are building blocks of RNA and DNA. In RNA, nucleotide are made up of ribose sugar, a nitrogenous base which can be adenine, uracil, cytosine and guanine; and a phosphate group. The nucleotides in RNA are called ribonucleotides. The nucleotides in DNA are called deoxyribonucleotides and they contain a deoxyribose sugar, a phosphate group and a nitrogenous base which can be adenine, thymine, cytosine and guanine.

Answer:

Glycolysis  

Link reaction.  

Krebs cycle.  

Electron transport chain

A.P.E.X approved

The four main steps of cellular respiration are: 1. Glycolysis, 2. Pyruvate Decarboxylation, 3. Krebs Cycle, and 4. Electron Transport Chain.

The four main steps of cellular respiration take place in the mitochondria of eukaryotic cells.

1. Glycolysis: This occurs in the cytoplasm and involves the breakdown of glucose into two molecules of pyruvate. It produces a small amount of ATP through substrate-level phosphorylation and also generates NADH, which carries high-energy electrons.

2. Pyruvate Decarboxylation: In the presence of oxygen, each pyruvate molecule is transported into the mitochondria and converted into acetyl CoA. This step releases carbon dioxide and generates NADH.

3. Krebs Cycle: Acetyl CoA enters the Krebs cycle, a series of enzymatic reactions that occur in the mitochondrial matrix. During this cycle, carbon dioxide is released, and NADH, FADH2, and a small amount of ATP are generated.

4. Electron Transport Chain: The NADH and FADH2 produced in the previous steps donate their electrons to the electron transport chain, located in the inner mitochondrial membrane. As the electrons move through the chain, energy is released and used to pump protons across the membrane, creating a proton gradient.

These four steps of cellular respiration work together to efficiently extract energy from glucose molecules, allowing cells to meet their energy demands.

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Answer:

Primary productivity in an ecosystem is important because it lays the foundation of the food chains and food webs being observed in an ecosystem. It is the initial and main source through which energy is added into the food chains and food webs in an ecosystem. The organisms in which primary productivity occurs bring energy for the different organisms living in an ecosystem. Without them, energy will not be able to flow through an ecosystem as there will be no energy produced.

A semipermeable membrane is a barrier with tiny openings that allow only certain small molecules to pass through, playing a crucial role in processes like osmosis.

The best definition for a semipermeable membrane is (b) It is a barrier with tiny openings that allow some, but not all, materials to pass through. This type of membrane has small pores that allow only small molecules to pass through while preventing others. Additionally, in some kinds of semipermeable membranes, certain molecules can dissolve in the membrane and diffuse across it. This is essential in processes such as osmosis, where the semipermeable membrane regulates the movement of water across itself to balance solute concentrations on both sides.

" The correct option is A. The correct climatic zone where Douglas fir, redwood, spruce, and cedar trees would be found is A. marine west coast.

These trees are adapted to survive in areas with heavy precipitation, which is a characteristic of the marine west coast climate. This climate is dominated by the oceanic climate and is typically found on the western sides of continents between the latitudes of 40° and 60°. It is characterized by mild winters, cool summers, and abundant rainfall throughout the year, which is ideal for the growth of these types of trees.

On the other hand, the humid subtropical climate (C) does have significant rainfall, but it also features hot summers and generally experiences more seasonal variation in precipitation, which may not be as suitable for these specific tree species. The Mediterranean climate (B) is known for its dry summers and wet winters, which is not consistent with the conditions preferred by these trees. The steppes climate (D) is semi-arid with low precipitation, which would not support the growth of these trees that are adapted to heavy precipitation.

Therefore, the marine west coast climate (A) is the most appropriate choice for the habitat of Douglas fir, redwood, spruce, and cedar trees."

Answer:

Reproductive cells have half the amount of chromosomes than body cells

Explanation:

I think that you are talking about body cells when you say "most cells in an organism." If that is the case, then the reproductive cells, sperm and egg cells, have half the amount of chromosome than body cells.

For example: Human body cells have 46 chromosomes. Human reproductive cells has 23 chromosomes.

In sexual reproduction, each parent gives 1/2 of a full set of chromosomes to create the full set needed for an organism.

The chromosome number in the vegetative cells of an organism is usually a double of the chromosome number in its reproductive cells.

Normal organisms contain a diploid (2n) number of chromosomes. Usually, the sex cells such as sperm and egg cells contain half of the number of chromosomes in other non-reproductive parts of organisms. sex cells such as sperm and egg cells participate in sexual reproduction. Hence, they are otherwise known as gametes.

During fertilization, the sperm cell with its haploid (n) chromosome number fuses with the egg cell, also with its haploid chromosome number to form a zygote (2n) with a complete chromosome set.

Without the sex cells containing half of the normal diploid chromosome, resulting zygotes from fertilization will not be having the normal chromosome number of organisms.

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Answer:

1. Auxins is a plant hormone that plays role in the differentiation of vascular tissue, stimulates the release of ethylene, prevention of abscission, controls cellular elongation, and enhances fruit development. Cytokinin plays an important role in cell division, delay senescence, and activating dormant buds in plants. The function of ethylene hormone in plants is in fruit ripening, promoting abscission. Gibberellins stimulate pollen tube growth,  cause elongation of stems, initiate mobilization of storage materials in seeds during germination.

2. During transpiration, water is pulled from the roots to the leaves through a tissue called the xylem. As water evaporates out of the leaf, more water is 'pulled upwards' to replace lost water.

3. The stomata in the leaves are surrounded by guard cells. They can regulate the rate of transpiration by opening and closing the stomata.

4.During pressure flow, the sugar is transported from leaves to roots and phloem cells through the phloem via active transport.

5.

Phototropism refers to the growth of a plant in response to a light stimulus.

Example:  Sunflowers --  flowers turn to face with the sunlight.

Geotropism is a process in which plant grows in response to gravity.

Example: Roots -- grow downward in response to gravity

Thigmotropism is the directional response of a plant organ to  physical contact with a solid object.

Example: the growth of ivy on walls --  upon contact to walls

A chain reaction in fission nuclear reactions results in more neutrons being produced.

A nuclear chain reaction can be defined as a series of nuclear fissions which occurs when the neutrons released produces an additional nuclear fission in an average of one or more atomic nucleus.

This ultimately implies that, neutrons are used to trigger or initiate fission nuclear reactions in a nuclear chain reaction.

In conclusion, we can deduce that a chain reaction in fission nuclear reactions results in more neutrons being produced.

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Computer model of the enzyme will help researcher investigate its reaction specificity, the effect of alteration or concentration, kinetics of the reaction.

Explanation:

Maltase enzyme is found in saliva and pancreatic juices. Its function is to convert maltose into simpler absorbing form glucose in the process of digestion.

Computer model of enzymes are studied and observed for below-mentioned reasons:

The substrate-enzyme complex pf maltase can be studied to know the specificity of the enzyme.

Chemical structure of the maltase enzyme can be known.

The Activation energy of maltase enzyme can be known.

Enzyme kinetics of the maltase will be studied.

Concept of allosteric sites is studied.

The effect of a mutation on the enzyme can be studied.

The effect of change in concentrations of enzymes or substrate could be studied.

A computer model of the Maltese enzyme could help the researcher to investigate the substrate specificity and reaction kinetics of the enzyme.

It is an enzyme that converts maltose or malt sugar into glucose. It is found in saliva and pancreatic juice.

A computer model of enzyme can help the researcher in the following ways,

Therefore, a computer model of the Maltese enzyme could help the researcher to investigate the substrate specificity and reaction kinetics of the enzyme.

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a) If II2 is a carrier (heterozygous Hh), there is a 50% chance of having a hemophiliac child, as she could pass on the recessive allele (h) to her offspring.

b) The chance of having a hemophiliac boy is 50%, as II2 can pass on either the normal allele (H) or the recessive allele (h) to the child.

c) The probability of her first child being phenotypically normal is 50%, as she can pass on either the normal allele (H) or the recessive allele (h) to her child.

d) This indicates that she is either homozygous dominant (HH) or a carrier (Hh).

(a) To determine the probability of the first child being a hemophiliac when individual 1-1-2 (II2) marries a normal man, you need to know the genotype of II2.

If II2 is a carrier (heterozygous Hh), there is a 50% chance of having a hemophiliac child, as she could pass on the recessive allele (h) to her offspring.

(b) If the first child is a hemophiliac, it indicates that II2 is a carrier (Hh). If II2 has another child with a normal man, the chance of having a hemophiliac boy is 50%, as II2 can pass on either the normal allele (H) or the recessive allele (h) to the child.

(c) If II4 has children with a hemophiliac man, you need to know the genotype of II4.

If II4 is phenotypically normal, it means she must be a carrier (Hh).

The probability of her first child being phenotypically normal is 50%, as she can pass on either the normal allele (H) or the recessive allele (h) to her child.

(d) If the mother of 1-2 (II2) is phenotypically normal, it means she does not express the hemophilia trait.

This indicates that she is either homozygous dominant (HH) or a carrier (Hh).

Answer:

           [tex]\large\boxed{\large\boxed{\text{You would expect 50 seedings in each forest}}}[/tex]

Explanation:

1. Number of turkey oak seedlings in the burned forest (given): 10 seedlings

2. Number of turkey oak seedings in the unburned forest (given): 90 seedings

3. To find the total number of turkey seedings you must add the seedings found in the burned forest and the seedings found in the unburned forest:

4. If the seedlings were randomly distributed in the two forests, then the numbers of seedlings in each forest would be the same (given)

How many seedlings would you expect in each forest if they were randomly

distributed?

Since it is stated that the numbers of seeding in each forest would be the same, then you must divide the total number of seedings by 2:

Which means that you would expect 50 seedings in each forest if they were radomly distributed.

Answer:

All Blood Types

Explanation:

Answer: The possible blood types are A and B.

Explanation: Blood types are classified on the basis of the antigen type present in an individual. There are two types of antigens, antigen A and B. An individual with blood type O has no antigen, while an individual with blood type AB has both antigens. An individual with blood type A has antigen A while an individual with blood type B has antigen B. When A woman with blood type O crosses with a man with blood type AB, the child inherits no antigen from the mother but inherits either antigen A or B from the father.

See the attached punnet square for more information.

Answer:

Like every other organism the population size of the humans have increased over time.

Explanation:

With the improvements in science and technology, life becomes better and better for human beings. In the past, when there were no discoveries for curing diseases, the human population declined because of the spread of various diseases and famine conditions.

But as the developments in the scientific world are made, it has been easier to cure diseases and other problems. As a result, the population size of the human goes on increasing.

Human population has grown exponentially, particularly after the Industrial Revolution, due to advancements in healthcare, agriculture, and technology.

The human population size has undergone significant changes throughout history. In ancient times, the human population was relatively small, likely in the millions.

The advent of agriculture around 10,000 BCE marked a turning point, leading to a gradual increase in population due to improved food production and settled living.

The Industrial Revolution brought about significant advancements in technology, healthcare, and sanitation, leading to a rapid increase in population. This period saw the first major population boom.

In the 20th century, there was an unprecedented explosion in the global population, often referred to as the population explosion.

Advancements in medicine, hygiene, and nutrition significantly reduced mortality rates and increased life expectancy. Access to clean water and sanitation improved, contributing to better health outcomes.

The world population surpassed 7 billion around 2011 and continues to grow, albeit at a slower rate than in the mid-20th century. Various factors influence this growth, including advancements in healthcare, education, family planning, and economic development.

Demographic shifts, migration patterns, and social changes also play significant roles in shaping population dynamics.

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Answer:

Density of water

Explanation:

We observed that the density of water in the form of ice is lesser when compared to the density of water in the liquid form. This property of water cause ice to float on liquid water.

In the real life, fishes are alive even when water freezes, the molecules form more stable hydrogen bonds. This causes the molecules to not be as closer to one another as compared to water in the liquid form. As a result, the density of ice water becomes lesser. water is most dense at 4 degrees Celsius which causes ice to float on water.

Changes in mitosis, crossing over, random fertilization and random arrangement in meiosis.

Explanation:

Genetic diversity of sexually reproducing organisms are controlled by many factors and they are - changes in mitosis, crossing over, random fertilization and random arrangement in meiosis.

During crossing over, the sister chromatids of homologous chromosome crossover and exchange their genes which leads to recombination eventually causing genetic diversity.

Random fertilization of male and female gametes leads to the formation of zygote having the genetic content of both maternal and paternal gametes causing variation.

Environmental factors also causes some change in with time.

Sexual reproduction increases genetic diversity through crossing-over, independent assortment, and the random union of gametes, leading to offspring that are genetically unique from their parents.

The process of sexual reproduction is critical to the genetic diversity of sexually reproducing organisms. Several factors contribute to this diversity:

Crossing-over during meiosis allows for the exchange of genetic material between homologous chromosomes, creating new combinations of genes.

Independent assortment of chromosomes during meiosis results in gametes with various possible combinations of chromosomes, contributing to genetic variation.

The random union of gametes ensures that each zygote (fertilized egg) has a unique genetic makeup, further promoting genetic diversity.

These mechanisms ensure that offspring have a combination of alleles and genes that are different from both parents, providing a wealth of genetic variation that forms the basis for evolutionary adaptation and the capacity of species to survive changes in the environment.

Answer: C

Explanation:

Uncontrolled cell division is how most cancer starts and continues. Once cells begin dividing uncontrollably the cancer begins to form and gets larger until it’s removed.

Answer AND Explanation:

Stimulation of the membrane causes it to become highly permeable to sodium ions, which diffuse rapidly to the inside due to the concentration gradient. The inside of the membrane becomes positively charged and the outside negatively charged. The membrane is then said to be depolarized. This constitutes the action potential. The reverse of the polarity of the membrane causes the beginning of repolarization.

Answer:

Chromosomal mutations: produce changes in the number or structure of chromosomes (they include deletions, duplications, inversions, and translocations). Deletion: involves the loss of all or part of a chromosome.

Final answer:

Deletions describe the loss of a chromosome segment, often resulting in many genes missing, and represent a chromosomal mutation, while gene mutations refer to smaller-scale alterations affecting specific gene sequences within the DNA.

Explanation:

The difference between a gene mutation and a chromosomal mutation lies in the scale of the genetic alteration. A gene mutation, also known as a point mutation, involves a change in a single base pair or a few nucleotides within the DNA sequence, affecting a single gene. This is considered to be a micro-level alteration. On the other hand, a chromosomal mutation results in changes at the chromosome level, such as deletions where a large segment of a chromosome is lost, which may involve several to hundreds of genes, or duplications, where a section of the chromosome is repeated.

Chromosomal mutations can have significant consequences such as developmental delays, as illustrated by trisomy 21, which causes Down Syndrome. Other examples include inversions, where a segment of a chromosome breaks off, flips, and reattaches, and translocations, where segments between non-homologous chromosomes are exchanged. These large-scale alterations often impact multiple genes and can influence the overall structure and function of the chromosomes, leading to more profound effects on an organism compared to most gene mutations.

According to the image, the location of T is 350 meters high.

A topographical map is the main type of map used to represent elevation, often through the use of contour lines. In a Geographic Information System (GIS), digital elevation models (DEM) are commonly used to represent the surface (topography) of a place, through a raster (grid) dataset of elevations.

In a topographic map, the information must be precise, allowing to know, in addition to the exact location of

The altimetry quotas that represent its relief.

With this information, we can conclude that in the topographical map, the location T is 350 meters high.

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Answer:

Gregor Mendel

Explanation:

It wasn't until 1865 that an Augustinian Monk named Gregor Mendel found that individual traits are determined by discrete "factors," later known as genes, which are inherited from the parents. His rigorous approach transformed agricultural breeding from an art to a science.

The waters off the coast of France are cold because the gyre rotates clockwise, bringing cold water from the north

Explanation:

In general, the oceanic gyres located in the northern hemisphere circulate in a clockwise direction to form the huge circular currents on the ocean surface.

This clockwise rotation is because of the Coriolis Effect which deflects the global wind to the right side of the northern hemisphere along with the surface ocean winds causing the clockwise rotational movements.

The North Atlantic Ocean gyre rotates the wind clockwise, brings in the cold air from the north and rotates along western Europe.

Further, the Beaufort gyre also rotates clockwise and rotates the cold Siberian and Arctic waters from the north to the Atlantic Ocean. Thus the waters of the western coastal regions of France get cooler.

Answer: The correct answer is C: The gyre rotates clockwise, bringing cold water from the north. I took the Earth Science 2.07 Ocean Currents Quiz and got 100% with answer C!

Explanation: In the Northern Hemisphere, the Coriolis effect causes clockwise motion to the right.

This pattern is called a gyre, which consists of the Gulf Stream, North Atlantic Current, Canary Current, and North Equatorial Current.

Gyres in the Northern Hemisphere rotate clockwise, while those in the Southern Hemisphere rotate counterclockwise.

Answer:

The answer is A.

Explanation:

The clouds begin to form in the atmosphere when the sun causes evaporation of water on Earth.

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Answer:

c

Explanation: