FREE AP Biology MCQ Question and Answers

Question 1

The small intestine contains villi and microvilli, which aid in reabsorption by

Accepted Answer

increasing the surface area of the small intestine

Answer

making the small intestine more hydrophobic

Answer

decreasing the surface area of the small intestine

Answer

making the small intestine more hydrophilic

Question 2

In the small intestine, which of the following DOES NOT occur?

Accepted Answer

Pepsin breaks down proteins to amino acids

Answer

Bile emulsifies fats into smaller fat particles

Answer

Pancreatic lipase breaks down fats into fatty acids and glycerol.

Answer

Pancreatic amylase breaks down carbohydrates into simple sugars.

Question 3

Which of the following best describes the route a secretory protein will likely take during its synthesis in an animal cell?

Accepted Answer

Ribosome–rough ER–Golgi apparatus–secretory vesicle–plasma membrane

Answer

Ribosome–Golgi apparatus–rough ER–secretory vesicle–plasma membrane

Answer

Plasma membrane–Golgi apparatus–ribosome–secretory vesicle–rough ER

Answer

Plasma membrane–Golgi apparatus–ribosome–secretory vesicle–rough ER

Question 4

The following statements about alleles are all true, EXCEPT for

Accepted Answer

an individual with two identical alleles is said to be heterozygous with respect to that gene

Answer

alleles are found on corresponding loci of homologous chromosomes

Answer

alleles are alternative forms of the same gene

Answer

a gene can have more than two alleles

Question 5

Which of the following statements is the LEAST plausible explanation for the seeming low frequency of mutations, despite the fact that mutations happen at a regular and predictable rate?

Accepted Answer

The predictable rate of mutation results in ongoing variability in a gene pool.

Answer

Some undesirable phenotypic traits may be prevented from reproducing.

Answer

Some mutations cause such drastic phenotypic changes that they are removed from the gene pool.

Answer

Some mutations produce alleles that are recessive and may not be expressed.

Question 6

Which of the following adaptations is least likely to be present in a creature that inhabits a hot, arid environment?

Accepted Answer

Short loops of Henle to maximize water secretion

Answer

Large ears to aid in heat dispersion

Answer

Long loops of Henle to maximize water reabsorption

Answer

Storage of water in fatty tissues

Question 7

Which of the following best explains why legumes can thrive in nitrogen-deficient soils?

Accepted Answer

These plants have a mutualistic relationship with nitrogen-fixing bacteria

Answer

These plants do not require nitrogen to make plant proteins

Answer

These plants make their own proteins

Answer

These plants are capable of directly converting nitrogen gas into nitrates