Question 1

Which of the following best explains why steroid hormones, such as cortisol, can pass through cell membranes and directly affect gene expression, while peptide hormones, such as insulin, cannot?

Accepted Answer

Steroid hormones are lipid-soluble and can diffuse through the phospholipid bilayer, whereas peptide hormones are water-soluble and bind to cell surface receptors.

Question 2

A population of frogs is split by the construction of a highway, preventing gene flow between the two groups. Over time, the two populations diverge genetically and can no longer interbreed. This is an example of:

Accepted Answer

Allopatric speciation

Question 3

Which of the following is a correct sequence of events during early embryogenesis in animals?

Accepted Answer

Fertilization → Cleavage → Blastula formation → Gastrulation

Question 4

Which of the following best describes the difference between the nervous system and the endocrine system in terms of signal transmission?

Accepted Answer

The nervous system uses electrical and chemical signals for rapid, short-term responses; the endocrine system uses hormones for slower, long-term regulation.

Question 5

Which of the following is NOT a prezygotic barrier to reproduction?

Accepted Answer

Reduced hybrid fertility

Question 6

A researcher observes that a certain fish species can survive in both freshwater and saltwater environments by actively regulating the movement of ions across their gills. This is an example of:

Accepted Answer

Osmoregulation

Question 7

Which of the following best describes the role of the loop of Henle in the mammalian kidney?

Accepted Answer

It reabsorbs water and concentrates urine by creating a gradient of osmolarity in the medulla.

Question 8

Which of the following is a correct comparison between open and closed circulatory systems?

Accepted Answer

Closed circulatory systems have higher pressure and more efficient nutrient delivery than open systems.

Question 9

Which of the following is an example of mutualism?

Accepted Answer

Bees pollinating flowers while collecting nectar

Question 10

Which of the following best explains why the acrosomal reaction is important during fertilization?

Accepted Answer

It allows the sperm to penetrate the zona pellucida and fuse with the egg membrane.

Question 11

Which of the following is a key adaptation that allowed plants to colonize land?

Accepted Answer

Formation of a cuticle to reduce water loss

Question 12

Which of the following best describes the difference between oogenesis and spermatogenesis in humans?

Accepted Answer

Oogenesis results in one viable ovum and polar bodies, while spermatogenesis produces four viable sperm per meiotic event.

Question 13

Which of the following is a function of the myelin sheath in neurons?

Accepted Answer

It increases the speed of action potential conduction along the axon.

Question 14

Which of the following is a postzygotic barrier to gene flow between species?

Accepted Answer

Reduced hybrid viability

Question 15

Which of the following best describes the difference between innate and adaptive immunity?

Accepted Answer

Innate immunity provides a rapid, general defense; adaptive immunity develops more slowly and is highly specific.

Question 16

Which of the following is a correct statement about the three domains of life?

Accepted Answer

Eukarya includes all multicellular organisms, while Bacteria and Archaea are only unicellular.

Question 17

Which of the following best explains why genetic drift can have a significant impact on small populations?

Accepted Answer

Random changes in allele frequencies are more likely to lead to loss of genetic variation in small populations.

Question 18

Which of the following is an example of a negative feedback loop in human physiology?

Accepted Answer

Increased blood glucose stimulates insulin secretion, which lowers blood glucose.

Question 19

Which of the following best describes the function of villi and microvilli in the small intestine?

Accepted Answer

They increase the surface area for nutrient absorption.

Question 20

Which of the following is a correct description of the relationship between body size, metabolic rate, and temperature regulation in animals?

Accepted Answer

Smaller animals lose heat more rapidly and have higher metabolic rates per gram than larger animals.

Comprehensive Study Guide for College Biology Final Exam

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