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 weakness?

Accepted Answer

The experiment did not account for trade-offs between immune function and reproductive success.

Question 3

Which tissue type is characterized by cells that are tightly joined together, forming continuous sheets that cover surfaces and line 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 the role of a negative feedback loop in homeostasis?

Accepted Answer

It detects changes and initiates responses that return the system to a set point.

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

Why do humans excrete urea instead of ammonia?

Accepted Answer

Urea is less toxic and requires less water to excrete than ammonia.

Question 9

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 10

Which hormone increases water reabsorption in the collecting duct of the nephron?

Accepted Answer

Antidiuretic hormone (ADH)

Question 11

According to Fick’s Law, the rate of diffusion of a gas across a membrane is given by $$J = D \frac{A(P_1$ - P_2$)}{d}. If $$the surface area ($$A) $$doubles and the thickness ($$d) is $$halved, how does the rate of diffusion change?

Accepted Answer

It increases by a factor of 4.

Question 12

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 more oxygen to tissues.

Question 13

Which blood vessel type has the highest blood pressure, and why?

Accepted Answer

Arteries, because they receive blood directly from the heart under high pressure.

Question 14

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 15

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

Accepted Answer

They are all-or-none events that do not diminish as they propagate.

Question 16

Which neurotransmitter event creates an excitatory postsynaptic potential (EPSP)?

Accepted Answer

Opening of Na$$^+$$ channels causing Na$$^+$$ influx

Question 17

Which brain lobe is primarily responsible for processing visual information?

Accepted Answer

Occipital lobe

Question 18

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 19

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

Accepted Answer

Human chorionic gonadotropin (hCG)

Question 20

During gastrulation, which germ layer gives rise to the nervous system?

Accepted Answer

Ectoderm

Animal Structure, Function, and Physiology: Study Guide

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