Free AP Biology Question and Answers

Question 1

In humans, the Krebs cycle takes place in the

Accepted Answer

mitochondrial matrix

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outer mitochondrial membrane

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intermembrane space

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inner mitochondrial membrane

Question 2

One distinction between the two types of cellular reproduction—meiosis and mitosis—is that in meiosis

Accepted Answer

separation of sister chromatids occurs during the second division, whereas in mitosis separation of sister, chromatids occur during the first division

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spindle fibers form during prophase, whereas in mitosis the spindle fibers form during metaphase

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there is one round of cell division, whereas in mitosis there are two rounds of cell division

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chromosomes are replicated during interphase, whereas in mitosis chromosomes are replicated during prophase

Question 3

Which of the following DOES NOT describe a bacterial trait?

Accepted Answer

Membrane-bound cellular organelles

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Plasma membrane consisting of lipids and proteins

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Ribosomes that synthesize polypeptides

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Circular double-stranded DNA

Question 4

Which of the following statements most accurately describes why a population is referred to as the evolutionary unit?

Accepted Answer

Individuals cannot evolve, but populations can

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Natural selection affects individuals, not populations

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Genetic changes can only occur at the population level.

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The gene pool in a population remains fixed over time

Question 5

The endocrine system uses a variety of feedback mechanisms to maintain homeostasis. Which of the following best describes favorable criticism?

Accepted Answer

Infant suckling causes a mother's brain to release oxytocin, which in turn stimulates milk production.

Answer

An enzyme is allosterically inhibited by the product of the reaction it catalyzes.

Answer

When blood sugar levels decrease to normal after a meal, insulin is no longer secreted.

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When ATP is abundant the rate of glycolysis decreases

Question 6

A guinea pig cross is performed by a scientist using two animals with identical black coats. White hair coat is subordinate to black hair coat. One-fourth of the offspring have white coats, compared to three-quarters who have black coats. Most likely, the parents' genotypes were

Accepted Answer

Bb × Bb

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BB × Bb

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bb × bb

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Bb × bb

Question 7

A volcanic eruption decimates a sizable island. With the exception of the group's largest male and female horses, the majority of the horses perish. They remain alive, procreate, and maintain the population. Given that weight is highly heritable and that the distribution of weights resembles a binomial distribution, the following generation's kids should have

Accepted Answer

a higher mean weight compared with members of the original population

Answer

a lower mean weight compared with their parents

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a higher mean weight compared with their parents

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the same mean weight as members of the original population