Chapter 30: Biology

List the basic traits of animal phylum:

• They are eukaryotes, monophyletic, and share a common ancestor with choanoflagellates

• They are polyphyletic, prokaryotes, and share a common ancestor with sponges

• They are eukaryotes, polyphyletic, and share a common ancestor with ants

• They are prokaryotes and monophyletic

Animal characteristics are:

• No cell walls, multicellular, heterotrophic, obtain nutrients through ingestion, most have tissues. (except sponges)

• Protists, single-celled or colonial, live in salt and freshwater.

Choanoflagellates characteristics are:

• No cell walls, multicellular, heterotrophic, obtain nutrients through ingestion, most have tissues. (except sponges)

• Protists, single-celled or colonial, live in salt and freshwater.

Animal Molecular Phylogeny is the _______________.

• • Current method to organize and classify animals

• • Based on DNA sequences

• • It is similar to the morphological phylogeny that preceded it (pre- 1997)

• All of the above

How old is the animal kingdom?

• • 60 million to 15 billion years old

• • 600 million to 1.5 billion years old

• • 700 million to 3 billion years old

• • 600 million to 12 billion years old

How long ago did the Cambrian explosion occur?

• 550 mya

• 600 mya

• 650 mya

• 500 mya

Animals reproduce sexually. Can they reproduce asexually?

• Yes

• No

Which of the following is right?

• • Diploid (2N) stage is dominant,

  • Haploid (1N) gametes

• • Diploid (1N) stage is dominant,

  • Haploid (2N) gametes

What percentage of animals undergo metamorphosis?

• 80%

• 90%

• 70%

• 83%

Early embryonic development order is:

• Cleavage, gastrulation, gastrula stage

• Cleavage, blastula stage, gastrulation, gastrula stage

• Cleavage, gastrulation, gastrula stage, blastula stage

• Cleavage, blastula stage, gastrula stage, gastrulation