Question 1

Which of the following features is unique to the phylum Echinodermata and not found in any other animal phylum?

Accepted Answer

Presence of a water vascular system

Question 2

A scientist discovers a new animal species with the following characteristics: bilateral symmetry, a pseudocoelom, a complete digestive tract, and a tough cuticle that is periodically shed. To which phylum does this organism most likely belong?

Accepted Answer

Nematoda

Question 3

Which of the following is a defining characteristic of all chordates at some point in their development?

Accepted Answer

A notochord

Question 4

Which class of molluscs is characterized by a highly developed nervous system, a closed circulatory system, and the ability to rapidly change skin color for camouflage?

Accepted Answer

Cephalopods

Question 5

Which of the following statements best describes the main difference between the domains Bacteria and Archaea?

Accepted Answer

Archaea have unique membrane lipids not found in Bacteria

Question 6

Which of the following is a major evolutionary advantage of the closed circulatory system found in vertebrates compared to an open circulatory system?

Accepted Answer

It allows for more efficient delivery of oxygen to tissues

Question 7

A patient is diagnosed with atherosclerosis. Which of the following best describes the physiological change occurring in their blood vessels?

Accepted Answer

Accumulation of fatty deposits in arterial walls, narrowing the lumen

Question 8

Which of the following best explains why antibiotics are generally ineffective against viral infections?

Accepted Answer

Viruses lack the cellular structures targeted by antibiotics

Question 9

Which of the following is a correct sequence of events in the specific (acquired) immune response?

Accepted Answer

Antigen presentation → Activation of helper T cells → Activation of B cells → Production of antibodies

Question 10

Which of the following best distinguishes active immunity from passive immunity?

Accepted Answer

Active immunity involves the production of memory cells by the recipient

Question 11

Which of the following bones articulates directly with the humerus in the human body?

Accepted Answer

Ulna

Question 12

Which of the following is a function of osteoclasts during bone remodeling?

Accepted Answer

Breakdown of bone matrix to release calcium

Question 13

Which of the following is a risk factor for decreased bone density (osteoporosis)?

Accepted Answer

Low dietary calcium intake

Question 14

Which type of synovial joint allows for the greatest range of motion?

Accepted Answer

Ball-and-socket joint

Question 15

Which of the following is a similarity between gymnosperms and angiosperms?

Accepted Answer

Both produce seeds

Question 16

Which of the following is a distinguishing feature of monotreme mammals compared to marsupials and placental mammals?

Accepted Answer

They lay eggs

Question 17

Which of the following best describes the main function of platelets in human blood?

Accepted Answer

Initiating blood clotting

Question 18

A person receives a kidney transplant and their immune system attacks the new organ. This is an example of which type of immune problem?

Accepted Answer

Transplant rejection

Question 19

Which of the following is a characteristic of fungi that distinguishes them from plants?

Accepted Answer

Fungi obtain nutrients by absorption

Question 20

Which of the following best describes the evolutionary significance of the amniotic egg in vertebrates?

Accepted Answer

It allowed vertebrates to reproduce away from water

Unit 4 Study Guide: Animal Diversity, Microbes, Circulatory, Immune, and Skeletal Systems

Study Guide - Practice Questions

Study Guide - Flashcards