Animal Evolution – Chapter 17 Quiz

Which of the following is a key characteristic of animals?

Multicellular and heterotrophic

Which group of protists is considered the closest living ancestor to animals?

Choanoflagellates

What type of molecule is collagen, and why is it important in animals?

A structural protein providing support

What are Hox genes responsible for in animals?

Controlling body plan development

Which of the following terms refers to animals getting nutrients by consuming other organisms?

Heterotrophic

Which sequence correctly represents early animal embryonic development?

Egg + Sperm → Zygote → Cleavage → Morula → Blastula → Gastrulation

What is a zygote?

A fertilized egg

Which term refers to the first opening that forms during gastrulation?

Blastopore

What distinguishes a diploid cell from a haploid cell?

Diploid cells have two sets of chromosomes; haploid cells have one

Which of the following animals lacks true tissues?

Sponge

Which of the following animals has bilateral symmetry?

insect

What is the adaptive benefit of bilateral symmetry?

Directional movement and sensory concentration

Which animal lacks a coelom (body cavity)?

Flatworm

What is an advantage of having a coelom?

Cushioning for internal organs and improved mobility

In a protostome, what does the blastopore become?

The mouth