Question 1

Which of the following statements best describes the difference between protostomes and deuterostomes during embryonic development?

Accepted Answer

In protostomes, the blastopore develops into the mouth, while in deuterostomes, it develops into the anus.

Question 2

Which germ layer gives rise to the nervous system and outer covering of an animal during gastrulation?

Accepted Answer

Ectoderm

Question 3

A researcher discovers a new animal species with a body cavity that is completely lined by tissue derived from mesoderm. What type of body cavity does this animal possess?

Accepted Answer

Coelomate

Question 4

Which of the following best describes radial symmetry?

Accepted Answer

The body parts are arranged around a single main axis, allowing multiple planes to produce roughly equal halves.

Question 5

During early embryonic development, which process involves rapid mitotic cell divisions in the zygote?

Accepted Answer

Cleavage

Question 6

Which of the following is a characteristic unique to animals and not found in other eukaryotes?

Accepted Answer

Ingesting food for nutrition

Question 7

A biologist is studying an embryo that has only two germ layers. Which of the following terms best describes this organism?

Accepted Answer

Diploblast

Question 8

Which of the following best describes the function of the nervous system in animals?

Accepted Answer

It coordinates actions and transmits signals around the body.

Question 9

Which of the following is true regarding the difference between determinate and indeterminate cleavage?

Accepted Answer

Indeterminate cleavage results in cells that can develop into a whole organism.

Question 10

Which of the following best describes the anterior body axis in animals?

Accepted Answer

Toward the head

Question 11

A scientist observes an animal embryo with spiral cleavage and determinate development. To which group does this animal most likely belong?

Accepted Answer

Protostomes

Question 12

Which of the following statements about coelomates is correct?

Accepted Answer

Their body cavity is completely lined with mesoderm.

Question 13

Which of the following is a function of the endoderm during embryonic development?

Accepted Answer

Forms the lining of the digestive tract and lungs

Question 14

Which of the following best describes a pseudocoelomate animal?

Accepted Answer

An animal with a body cavity that is not completely lined by mesoderm

Question 15

Which of the following is an example of a real-world application of understanding animal embryonic development?

Accepted Answer

Developing treatments for congenital birth defects by studying gastrulation and germ layer formation

Question 16

Which of the following equations correctly represents the relationship between the number of chromosomes in a diploid animal cell ($$2n) $$and a gamete ($$n$$)?

Accepted Answer

$$2n = 2 	imes n$$

Question 17

Which of the following best explains why animals are considered heterotrophic?

Accepted Answer

They obtain energy by ingesting other organisms.

Question 18

Which of the following is a correct pairing of a germ layer and a structure it forms?

Accepted Answer

Mesoderm – muscles

Question 19

A mutation in a homeobox gene is most likely to affect which aspect of animal development?

Accepted Answer

The patterning and control of the body plan

Question 20

Which of the following best describes bilateral symmetry?

Accepted Answer

The body can be divided into two roughly equal halves along a single plane.

Animal Development and Body Organization: General Biology Study Notes

Study Guide - Practice Questions

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