Question 1

Which of the following characteristics is unique to animals and distinguishes them from plants and fungi?

Accepted Answer

Obtaining nutrients by ingestion and digesting food within their bodies

Question 2

Which extracellular structural protein is most abundant in animal cells and helps hold them together?

Accepted Answer

Collagen

Question 3

During animal embryonic development, which germ layer gives rise to the muscles and most internal organs?

Accepted Answer

Mesoderm

Question 4

Which of the following statements about animal reproduction is correct?

Accepted Answer

Most animals are diploid and reproduce sexually, producing haploid gametes by meiosis

Question 5

The Ediacara biota, discovered in South Australia, is significant because it represents:

Accepted Answer

An assemblage of soft-bodied animals from 575-550 million years ago, many unrelated to living organisms

Question 6

Which of the following best describes a true coelom?

Accepted Answer

A body cavity completely lined by tissues derived from mesoderm

Question 7

Which type of intercellular junction prevents fluid from moving between animal cells, as seen in epithelial tissues?

Accepted Answer

Tight junction

Question 8

The Cambrian explosion is notable in animal evolution because it marks:

Accepted Answer

A rapid diversification of animal body plans around 535-525 million years ago

Question 9

Which of the following is a function of a hydrostatic skeleton in soft-bodied animals?

Accepted Answer

Allowing movement and growth independent of the body wall by using fluid-filled cavities

Question 10

Which of the following is NOT a feature used to characterize animal body plans?

Accepted Answer

Ability to photosynthesize

Question 11

A researcher finds a fossil animal with bilateral symmetry, three tissue layers, and a body cavity completely lined with mesoderm. Which term best describes this animal's body plan?

Accepted Answer

Coelomate

Question 12

Which of the following statements about invertebrates is correct?

Accepted Answer

They lack a backbone and comprise roughly 96% of animal species

Question 13

Which embryonic tissue layer forms the lining of the future digestive tract in animals?

Accepted Answer

Endoderm

Question 14

Which of the following is a correct sequence of events in early animal embryonic development?

Accepted Answer

Zygote → Blastula → Gastrula → Larva

Question 15

Which of the following is a real-world example of an animal using ingestion to obtain nutrients?

Accepted Answer

A snake swallowing a deer whole

Question 16

Which of the following best explains why animal cells lack cell walls?

Accepted Answer

Cell walls would prevent the formation of intercellular junctions necessary for complex tissues

Question 17

Which of the following is a plausible reason why the Burgess Shale Formation is important to evolutionary biology?

Accepted Answer

It preserves a diverse array of Cambrian animal fossils, illustrating rapid diversification

Question 18

Which of the following is a function of gap junctions in animal tissues?

Accepted Answer

Allowing ions and small molecules to pass directly between adjacent cells

Question 19

A biologist discovers a new animal species with radial symmetry and two embryonic tissue layers. To which group does this animal most likely belong?

Accepted Answer

Cnidarians

Question 20

Which of the following best describes the evolutionary relationship between choanoflagellates and animals?

Accepted Answer

Choanoflagellates are close relatives of animals, sharing a common ancestor

Kingdom Animalia: Evolution, Diversity, and Body Plans

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