Question 1

Which of the following evolutionary milestones first appeared during the Cambrian explosion, as shown in the animal phylogeny diagram?

Accepted Answer

Emergence of bilateral symmetry and three tissue layers

Question 2

In the mammalian cardiovascular system diagram, which chamber receives oxygen-poor blood from the body?

Accepted Answer

Right atrium

Question 3

Which of the following best describes the difference between negative and positive feedback, as illustrated in the feedback loop diagram?

Accepted Answer

Negative feedback reduces the initial stimulus, while positive feedback amplifies it.

Question 4

Based on the blood glucose homeostasis diagram, what type of feedback is occurring when insulin is secreted in response to high blood glucose?

Accepted Answer

Negative feedback

Question 5

Given the data on blood vessel diameter, velocity, and pressure, which vessel type has the largest total cross-sectional area and the slowest blood velocity?

Accepted Answer

Capillaries

Question 6

Which adaptation allowed amniotes to reproduce successfully on land, as shown in the animal phylogeny diagram?

Accepted Answer

Evolution of the amniotic egg

Question 7

Which of the following is a key 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 8

Which of the following is an example of a regulator in terms of osmoregulation?

Accepted Answer

A freshwater fish that actively regulates its internal solute concentration

Question 9

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

Accepted Answer

It allows blood and water to flow in opposite directions, maximizing diffusion of oxygen into the blood.

Question 10

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

Accepted Answer

Regulation of blood glucose levels

Question 11

Which of the following is a characteristic unique to chordates?

Accepted Answer

Presence of a notochord at some stage of development

Question 12

Which of the following best describes the role of the control center in a negative feedback loop?

Accepted Answer

It compares sensor input to the set point and triggers a response if necessary.

Question 13

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

Accepted Answer

Release of oxytocin during childbirth, increasing uterine contractions

Question 14

Which of the following is a correct sequence of the four steps of the excretory process?

Accepted Answer

Filtration, reabsorption, secretion, excretion

Question 15

Which of the following best describes the function of the alveoli in the mammalian lung?

Accepted Answer

They are the site of gas exchange between air and blood.

Question 16

Which of the following is a distinguishing feature of arthropods?

Accepted Answer

Segmented body with jointed appendages and a hard exoskeleton

Question 17

Which of the following statements about the endocrine and nervous systems is correct?

Accepted Answer

The nervous system transmits signals rapidly via electrical impulses, while the endocrine system uses hormones for slower, longer-lasting effects.

Question 18

Which of the following is an example of a water-soluble hormone?

Accepted Answer

Insulin

Question 19

Which of the following best describes the function of the tracheal system in insects?

Accepted Answer

It delivers oxygen directly to body cells via a network of air-filled tubes.

Question 20

Which of the following is a correct pairing of animal group and circulatory system type?

Accepted Answer

Fish – single circulation

Animal Diversity, Internal Regulation, Nutrition, and Circulation: Study Guide for BIOL 191A

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