Question 1

Which of the following evolutionary innovations first allowed vertebrates to become dominant aquatic predators during the Cambrian period?

Accepted Answer

Evolution of jaws and a mineralized (bony) skeleton

Question 2

Which of the following best describes the relationship between animal body symmetry and feeding mode?

Accepted Answer

Bilateral symmetry is often linked to directional movement and active hunting

Question 3

Which of the following is a key adaptation that allowed amniotes to reproduce successfully on land?

Accepted Answer

Evolution of the amniotic egg

Question 4

Which of the following is NOT a function of the mammalian circulatory system?

Accepted Answer

Production of digestive enzymes

Question 5

Which of the following best explains why blood velocity is lowest in capillaries?

Accepted Answer

The total cross-sectional area of capillaries is greatest

Question 6

Which of the following statements about glucose homeostasis is correct?

Accepted Answer

Glucagon increases blood glucose by stimulating glycogen breakdown

Question 7

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

Accepted Answer

Filtration, reabsorption, secretion, excretion

Question 8

Which of the following is a major difference between open and closed circulatory systems?

Accepted Answer

Closed systems keep blood separate from interstitial fluid

Question 9

Which of the following best describes the function of the countercurrent exchange system in fish gills?

Accepted Answer

It maintains a gradient that maximizes oxygen diffusion into the blood

Question 10

Which of the following is a correct comparison between the endocrine and nervous systems?

Accepted Answer

The nervous system transmits signals rapidly and specifically

Question 11

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

Accepted Answer

Release of insulin in response to high blood glucose

Question 12

Which of the following best describes the role of macrophages in the innate immune system?

Accepted Answer

They engulf and digest pathogens through phagocytosis

Question 13

Which of the following is a characteristic unique to adaptive immunity?

Accepted Answer

Immunological memory after exposure to a pathogen

Question 14

Which of the following best explains why amphibians are restricted to moist environments for reproduction?

Accepted Answer

Their eggs lack a protective shell and are prone to desiccation

Question 15

Which of the following is a correct statement about the difference between Lophotrochozoa and Ecdysozoa?

Accepted Answer

Ecdysozoa include arthropods and nematodes, which molt their exoskeleton

Question 16

Which of the following is a correct description of the process of spermatogenesis in humans?

Accepted Answer

It results in four functional sperm cells from each primary spermatocyte

Question 17

Which of the following is a key difference between intracellular and extracellular digestion?

Accepted Answer

Extracellular digestion involves the breakdown of food outside of cells, often in a digestive cavity

Question 18

Which of the following best describes the function of helper T cells in the adaptive immune response?

Accepted Answer

They activate B cells and cytotoxic T cells by releasing cytokines

Question 19

Which of the following is a correct statement about the role of the kidney in homeostasis?

Accepted Answer

The kidney regulates the composition and volume of body fluids

Question 20

Which of the following is a correct comparison between arteries, veins, and capillaries?

Accepted Answer

Capillaries have the largest total cross-sectional area and the slowest blood flow

Animal Diversity, Physiology, and Homeostasis: Study Guide for BIOL 191A Exam 3

Study Guide - Practice Questions