Question 1

Which of the following best describes the difference between an adaptation and a trait in evolutionary biology?

Accepted Answer

A trait is a heritable characteristic, while an adaptation is a trait that increases fitness in a specific environment.

Question 2

In the cricket immune function experiment, which of the following was a major limitation?

Accepted Answer

The experiment could not distinguish between the effects of immune activation and energy trade-offs with reproduction.

Question 3

Which tissue type is characterized by cells that are tightly packed together, forming continuous sheets that line surfaces and cavities?

Accepted Answer

Epithelial tissue

Question 4

Which organ in the digestive system is primarily responsible for nutrient absorption, and what feature increases its surface area?

Accepted Answer

Small intestine; villi and microvilli

Question 5

Given two animals of similar shape, Animal A has a mass of 1 kg and Animal B has a mass of 16 kg. If the basal metabolic rate (BMR) is proportional to $$	ext{mass}^{0.75}$$, what is the ratio of Animal B's BMR to Animal A's BMR?

Accepted Answer

$$16^{0.75} = 8$

Question 6

Which of the following best describes a negative feedback loop in homeostasis?

Accepted Answer

A process where a deviation from a set point triggers a response that counteracts the deviation.

Question 7

A solution with a molarity of 2 M NaCl is compared to a solution with 0.5 M NaCl. Which statement is correct?

Accepted Answer

The 2 M solution is hypertonic relative to the 0.5 M solution.

Question 8

Which part of the nephron is primarily responsible for creating the countercurrent osmotic gradient, and what is its main function?

Accepted Answer

Loop of Henle; concentrating the filtrate by reabsorbing water and salts

Question 9

Which hormone increases water reabsorption in the kidney's collecting duct, and what is its effect on urine concentration?

Accepted Answer

Antidiuretic hormone (ADH); increases urine concentration

Question 10

According to Fick's Law, the rate of diffusion of a gas across a membrane is given by $$J = D \frac{A(P_2$ - P_1$)}{d}. $$Which change would most effectively increase the rate of oxygen diffusion into the blood?

Accepted Answer

Increasing the partial pressure difference $$(P_2$ - P_1$)$$

Question 11

Which of the following best explains the Bohr shift in hemoglobin's oxygen binding curve during exercise?

Accepted Answer

Decreased pH and increased CO$$_2$$ cause hemoglobin to release oxygen more readily.

Question 12

Which blood vessel type has the highest blood pressure, and what is the main force driving blood flow?

Accepted Answer

Arteries; pressure generated by ventricular contraction

Question 13

Which of the following best describes the sequence of electrical activation in the human heart?

Accepted Answer

SA node → AV node → Bundle of His/Purkinje fibers → ventricles

Question 14

Which of the following is a key property of action potentials in neurons?

Accepted Answer

They are all-or-none events that do not vary in magnitude.

Question 15

Which event occurs at the synapse to generate an excitatory postsynaptic potential (EPSP)?

Accepted Answer

Release of neurotransmitter that opens sodium channels in the postsynaptic membrane

Question 16

Which brain lobe is primarily responsible for processing visual information?

Accepted Answer

Occipital lobe

Question 17

Which of the following best describes the difference between asexual and sexual reproduction in animals?

Accepted Answer

Asexual reproduction produces genetically identical offspring, while sexual reproduction increases genetic diversity.

Question 18

Which process prevents polyspermy after fertilization in humans?

Accepted Answer

Cortical reaction leading to changes in the egg membrane

Question 19

Which hormone is produced by the embryo after implantation and is detected in pregnancy tests?

Accepted Answer

Human chorionic gonadotropin (hCG)

Question 20

Which germ layer gives rise to the nervous system during gastrulation?

Accepted Answer

Ectoderm

Animal Structure, Function, and Physiology: Study Guide

Study Guide - Practice Questions

Study Guide - Flashcards