Question 1

Which of the following is a unique characteristic of animal cells compared to plant and fungal cells?

Accepted Answer

They are supported by structural proteins such as collagen outside the cell membrane.

Question 2

During animal embryonic development, which process leads to the formation of a blastula?

Accepted Answer

Cleavage

Question 3

Which statement best describes the function of Hox genes in animals?

Accepted Answer

They regulate the expression of other genes that influence animal morphology.

Question 4

What evidence supports the hypothesis that choanoflagellates are the closest living relatives of animals?

Accepted Answer

Animal genes involved in cell adherence and signaling have sequence similarities in choanoflagellates.

Question 5

Which of the following is a function of a coelom in animals?

Accepted Answer

It enables internal organs to grow and move independently of the outer body wall.

Question 6

In protostome development, what is the fate of the blastopore?

Accepted Answer

It becomes the mouth.

Question 7

Which of the following best describes bilateral symmetry in animals?

Accepted Answer

Only one imaginary slice divides the animal into mirror-image halves.

Question 8

Which germ layer is responsible for forming muscles and most internal organs in triploblastic animals?

Accepted Answer

Mesoderm

Question 9

Which of the following is true about the Cambrian explosion?

Accepted Answer

It was a period of rapid animal diversification with the first large animal fossils with hard skeletons.

Question 10

Which clade includes all animals except sponges and a few others, and is characterized by the presence of true tissues?

Accepted Answer

Eumetazoa

Question 11

Which of the following is a defining feature of Ecdysozoans?

Accepted Answer

They shed their exoskeleton to allow for growth, a process called ecdysis.

Question 12

A researcher discovers a new animal species with spiral and determinate cleavage, a coelom formed by splitting of mesoderm, and a mouth that develops from the blastopore. To which developmental mode does this animal belong?

Accepted Answer

Protostome

Question 13

Which of the following statements about animal body cavities is correct?

Accepted Answer

A hemocoel is filled with hemolymph and is found in some invertebrates.

Question 14

Which of the following evolutionary innovations is most closely associated with the increase in animal diversity during the Cambrian explosion?

Accepted Answer

The evolution of the Hox gene complex and microRNAs.

Question 15

Which of the following is NOT a function of animal tissues?

Accepted Answer

Digesting food externally before absorption.

Question 16

Which of the following best explains why bilateral symmetry is advantageous for animals that move actively?

Accepted Answer

It enables a central nervous system to coordinate complex movements.

Question 17

Which of the following is a real-world example of a protostome animal?

Accepted Answer

Earthworm (annelid)

Question 18

Which equation best represents the process of cleavage in animal embryonic development?

Accepted Answer

$$	ext{Zygote} \xrightarrow{	ext{cleavage}} 	ext{Blastula}$$

Question 19

Which of the following statements about animal phylogeny is supported by molecular data?

Accepted Answer

All animals share a common ancestor.

Question 20

A biologist is studying an animal with a crown of ciliated tentacles used for feeding. To which clade does this animal most likely belong?

Accepted Answer

Lophotrochozoa

Chapter 32: An Overview of Animal Diversity – Key Concepts and Characteristics

Guida di studio - Domande di pratica

Study guide - Flashcard