Question 1

Which of the following is NOT a characteristic shared by all animals?

Accepted Answer

They are autotrophic and produce their own food.

Question 2

What is the primary function of collagen in animals?

Accepted Answer

It acts as an elastic connective tissue, providing structural support.

Question 3

A scientist treats an animal embryo with a chemical that prevents mesoderm formation. Which organ system is most likely to be affected?

Accepted Answer

Both digestive and skeletal systems

Question 4

Which of the following best describes the advantage of metamorphosis in animal life cycles?

Accepted Answer

It reduces competition between juveniles and adults by occupying different ecological niches.

Question 5

Which type of body symmetry is associated with cephalization and directional movement?

Accepted Answer

Bilateral symmetry

Question 6

During animal development, what is the significance of the blastula stage?

Accepted Answer

It is a hollow ball of cells that allows for tissue differentiation.

Question 7

Which of the following statements about coelomates is correct?

Accepted Answer

They have a body cavity completely lined with mesoderm.

Question 8

A digestive tract with a single opening, where food moves in two directions, is called:

Accepted Answer

A two-way or blind gut

Question 9

Which feeding strategy is used by animals that suck or mop up liquids like nectar, plant sap, or blood?

Accepted Answer

Fluid feeding

Question 10

Which ecological role is best exemplified by an animal that eats both plants and animals?

Accepted Answer

Omnivore

Question 11

What evolutionary advantage did the increase in atmospheric oxygen during the Cambrian explosion provide to animals?

Accepted Answer

It allowed for more efficient aerobic respiration, supporting larger and more active animals.

Question 12

Which of the following is a function of the Hox genes in animal development?

Accepted Answer

They determine the location of body parts during embryonic development.

Question 13

Which of the following best explains why bilateral symmetry and cephalization are often found together in animals?

Accepted Answer

Bilateral symmetry implies directionality of movement, so concentrating sensory organs at the front is advantageous.

Question 14

Which of the following is true about the evolution of animal body plans?

Accepted Answer

Key innovations arose at different times, and evolution is ongoing in all animal lineages.

Question 15

Which of the following best describes a pseudocoelomate?

Accepted Answer

An organism with a body cavity partially lined with mesoderm

Question 16

Which of the following is a real-world example of a mass feeder?

Accepted Answer

A lion eating chunks of meat from prey

Question 17

Which of the following statements about developmental regulatory genes is correct?

Accepted Answer

They activate protein-coding genes early in development to determine where body parts form.

Question 18

If a scientist inserted a mouse Hox gene for legs into a fly embryo and activated it at the antennae location, what would most likely occur?

Accepted Answer

The fly would develop legs where its antennae should be.

Question 19

Which of the following is NOT a function of a coelom in animals?

Accepted Answer

Serving as a site for photosynthesis

Question 20

Which of the following best describes the relationship between homology and homoplasy in animal evolution?

Accepted Answer

Homology refers to similar structures due to shared ancestry, while homoplasy refers to similar structures that evolved independently.

Introduction to Animals: Structure, Function, and Diversification

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