Question 1

Which of the following evolutionary innovations first appeared during the Cambrian explosion and contributed to the diversification of animal body plans?

Accepted Answer

Emergence of bilateral symmetry and three tissue layers

Question 2

Which of the following is a defining characteristic of amniotes?

Accepted Answer

Production of an amniotic egg with specialized membranes

Question 3

A researcher discovers a new animal species with a segmented body, jointed appendages, and a hard exoskeleton. To which group does this animal most likely belong?

Accepted Answer

Arthropods

Question 4

Which of the following best describes the difference between open and closed circulatory systems?

Accepted Answer

Closed systems confine blood to vessels, while open systems allow fluid to bathe organs directly.

Question 5

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

Accepted Answer

Secretion of insulin to lower blood glucose after a meal

Question 6

Which of the following best explains why countercurrent exchange in fish gills is more efficient than concurrent flow?

Accepted Answer

It maintains a constant gradient for oxygen diffusion across the entire gill surface.

Question 7

Which of the following is NOT a function of the mammalian kidney?

Accepted Answer

Production of insulin

Question 8

Which of the following best describes the role of the hypothalamus in homeostasis?

Accepted Answer

It coordinates the endocrine and nervous systems to regulate internal conditions.

Question 9

Which of the following is a correct sequence of the four steps of food processing in animals?

Accepted Answer

Ingestion → Digestion → Absorption → Elimination

Question 10

A patient is unable to produce sufficient insulin. Which of the following will most likely occur?

Accepted Answer

Blood glucose levels will remain elevated after eating.

Question 11

Which of the following adaptations is found in amniotes but NOT in amphibians?

Accepted Answer

Amniotic egg with specialized membranes

Question 12

Which of the following best describes the function of capillaries in the circulatory system?

Accepted Answer

They allow exchange of gases, nutrients, and wastes between blood and tissues.

Question 13

Which of the following is a real-world example of positive feedback?

Accepted Answer

Blood clotting after a vessel is damaged

Question 14

Which of the following statements about osmoregulators is correct?

Accepted Answer

They expend energy to maintain internal osmolarity different from the environment.

Question 15

Which of the following is a correct description of the cardiac cycle?

Accepted Answer

It is the alternating contraction and relaxation of the heart.

Question 16

Which of the following best explains why mammals are considered endothermic?

Accepted Answer

They generate heat through their own metabolism to maintain a stable internal temperature.

Question 17

Which of the following is a function of the lymphatic system?

Accepted Answer

Returning fluid and proteins to the blood

Question 18

Which of the following is a major difference between water-soluble and lipid-soluble hormones?

Accepted Answer

Lipid-soluble hormones bind to intracellular receptors, while water-soluble hormones bind to cell surface receptors.

Question 19

Which of the following best describes the process of filtration in the excretory system?

Accepted Answer

Extraction of water and small solutes from body fluid

Question 20

Which of the following is a correct example of a regulator in animal physiology?

Accepted Answer

A human maintaining a constant body temperature despite environmental changes

Animal Evolution, Physiology, Nutrition, and Circulation: BIOL 191A Unit 3 Study Guide

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