Question 1

Which of the following best explains why steroid hormones (such as cortisol) can pass through cell membranes, while peptide hormones (such as insulin) cannot?

Accepted Answer

Steroid hormones are lipid-soluble, allowing them to diffuse through the phospholipid bilayer.

Question 2

A population of beetles is split by a newly formed river, 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 $$\rightarrow$$ Cleavage $$\rightarrow$$ Blastula formation $$\rightarrow$$ Gastrulation

Question 4

Which of the following best describes the difference between the nervous system and the endocrine system?

Accepted Answer

The nervous system transmits signals rapidly via neurons, while the endocrine system releases hormones into the bloodstream for slower, longer-lasting effects.

Question 5

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

Accepted Answer

Release of oxytocin during childbirth, increasing uterine contractions

Question 6

A scientist observes that two unrelated species of fish living in similar cold-water environments have developed antifreeze proteins. This is an example of:

Accepted Answer

Convergent evolution

Question 7

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

Accepted Answer

It creates a concentration gradient in the medulla, allowing for water reabsorption.

Question 8

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

Accepted Answer

Reduced hybrid fertility

Question 9

Which of the following correctly matches the feeding mechanism with an example organism?

Accepted Answer

Filter feeding – Baleen whale

Question 10

Which of the following statements about open and closed circulatory systems is correct?

Accepted Answer

Closed circulatory systems allow for more efficient transport of oxygen to tissues.

Question 11

Which of the following best explains why amphibians are more susceptible to dehydration than reptiles?

Accepted Answer

Amphibians have permeable skin that allows water loss, while reptiles have scales that reduce evaporation.

Question 12

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 13

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

Accepted Answer

Oogenesis results in one functional ovum and polar bodies, while spermatogenesis produces four functional sperm.

Question 14

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 15

Which of the following is a correct description of the relationship between primary producers and primary consumers in a trophic structure?

Accepted Answer

Primary consumers obtain energy by eating primary producers.

Question 16

Which of the following best describes the role of the acrosomal reaction during fertilization?

Accepted Answer

It releases enzymes that help the sperm penetrate the egg's protective layers.

Question 17

Which of the following is a characteristic of adaptive immunity but NOT innate immunity?

Accepted Answer

Memory of previous exposures to specific antigens

Question 18

Which of the following best explains why gene flow can counteract the effects of genetic drift in small populations?

Accepted Answer

Gene flow increases genetic variation by introducing new alleles from other populations.

Question 19

Which of the following is a correct sequence of organization in multicellular animals, from simplest to most complex?

Accepted Answer

Cells $$\rightarrow$$ Tissues $$\rightarrow$$ Organs $$\rightarrow$$ Organ systems

Question 20

Which of the following best describes the function of the sodium-potassium pump ($$\mathrm{Na^+/K^+}-$$ATPase) in neurons?

Accepted Answer

It actively transports $$3\ \mathrm{Na^+}$$ out and $$2\ \mathrm{K^+} in$$, maintaining the resting membrane potential.

Comprehensive Biology Final Exam Study Guide – Key Concepts and Application

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