Question 1

The terms "acoelomate," "pseudocoelomate," and "coelomate" refer to

Accepted Answer

A)   levels of cephalization.
B)   the origin of the blastopore.
C)   ectoderm, mesoderm, and endoderm, respectively.
D)   the vertebrate body plan.
E)   the body cavities of animals.

Question 2

Sponges differ from other animals in that they

Accepted Answer

A)   do not form true organs.
B)   are sessile.
C)   are triploblastic.
D)   have trochophore larvae.
E)   are diploblastic.

Question 3

Because all animals must take in nutrients from their environment, the nutritional mode of animals is called

Accepted Answer

A)   heterotrophic.
B)   photoheterotrophic.
C)   photoautotrophic.
D)   chemolithotrophic.
E)   chemoautotrophic.

Question 4

Animals that lack an enclosed body cavity, such as flatworms, are called _______.

Accepted Answer

The answer of Animals that lack an enclosed body cavity,...

Question 5

Explain the fundamental difference between protostomes and deuterostomes.What evidence supports dividing organisms into these two groups?

Accepted Answer

Protostomes and deuterostomes differ in ...

Question 6

Refer to the figure.  In the typical hydrozoan life cycle shown, identify the diploid and haploid stages, identify the processes occurring in the boxes (mitosis, meiosis, fertilization, or fusion), and label the identified structures.

Accepted Answer

A. Diploid
B. Haploid
C. Medus...

Question 7

Which of the following characteristics distinguishes deuterostomes from protostomes?

Accepted Answer

A)   Segmentation
B)   Presence of Hox genes
C)   Embryological origin of the mouth
D)   Appendages
E)   Body symmetry

Question 8

Refer to the table, which compares 27 amino acid positions for ten different species.  Which character state(s)  is/are unique in the earthworm?

Accepted Answer

A)   10
B)   10 and 26
C)   10 and 11
D)   10, 11, and 26
E)   11 and 26

Question 9

With a fixed amount of available energy, a female animal is restricted in the size and number of eggs she can produce.This is not consistent with which of the following statements?

Accepted Answer

A)   She can produce many large eggs.
B)   She can produce many small eggs.
C)   She can produce a few large eggs.
D)   This is an example of an energy trade-off.
E)   Energy used to make shells cannot be used for her own growth.

Question 10

Refer to the figure.  Which statement concerning the medusa form of the jellyfish shown is false?

Accepted Answer

A)   It uses tentacles for catching prey.
B)   It exhibits radial symmetry.
C)   It uses cilia for movement.
D)   It stings prey with nematocysts.
E)   Contraction of the bell enables locomotion.

Question 11

Colonial animals differ from multicellular animals in that

Accepted Answer

A)   colonies may consist of physiologically integrated individuals.
B)   colonial animals may be genetically different from each other.
C)   individuals within a colony have identical functions.
D)   colonial animals are always unicellular.
E)   some colonies of animals are produced through fission.

Question 12

Refer to the figure.  Ctenophores have no nervous system and are radially symmetrical.Which group shown in the figure shares a trait with the ctenophores?

Accepted Answer

A)   Deuterostomes
B)   Eumetazoans
C)   Sponges
D)   Echinoderms
E)   Ecdysozoans

Question 13

Which of the following structures is/are not involved with some mechanism of movement in animals?

Accepted Answer

A)   Fluid-filled coelom
B)   Segmentation
C)   Appendages
D)   Cilia
E)   Blastopore

Question 14

Phylogenetic relationships between placozoans and sponges can best be determined by

Accepted Answer

A)   examining the number of germ layers.
B)   comparing body symmetry.
C)   observing reproductive strategies.
D)   observing motility of larval stages.
E)   determining substrates on which they occur.

Question 15

Which statement concerning ctenophores (the comb jellies)  is false?

Accepted Answer

A)   They eat small planktonic organisms.
B)   They use rows of cilia in locomotion.
C)   They use tentacles to catch prey.
D)   They have complete digestive systems.
E)   They have a polyp stage.

Question 16

Which of the following correctly describe the roundworm?

Accepted Answer

A)   Diploblastic and protostome
B)   Pseudocoelomate and deuterostome
C)   Acoelomate and protostome
D)   Pseudocoelomate and protostome
E)   Acoelomate and deuterostome

Question 17

_______ eat plants or parts of plants.

Accepted Answer

A)   Filter feeders
B)   Herbivores
C)   Predators
D)   Parasites
E)   Detritivores

Question 18

Animals appear to have evolved from a common ancestor.Which statement about the early evolution of animals is false?

Accepted Answer

A)   Studies of Hox genes suggest a polyphyletic origin for the animal kingdom.
B)   As predatory animals arose, the diversity of size and shape evolved.
C)   The evolution of complex behaviors may have occurred early in the origin of animals.
D)   Early on, natural selection favored larger and more motile animals.
E)   The division of labor among colonial cells was a major first step in the evolution of the animals.

Question 19

Refer to the table.  Which characters have shared, derived character states for protostomes?

Accepted Answer

A)   1 and 6
B)   2 and 3
C)   6 and 19
D)   20 and 27
E)   25 and 27

Question 20

All of the following are necessary parts of a hydrostatic skeleton except

Accepted Answer

A)   the relatively incompressible nature of fluids.
B)   a body cavity.
C)   segmentation.
D)   muscles.
E)   flexible surrounding tissues.

Exam 30: Animal Origins and the Evolution of Body Plans

Which of the following correctly describe the roundworm?

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_______ eat plants or parts of plants.

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Refer to the table, which compares 27 amino acid positions for ten different species. Which character state(s) is/are unique in the earthworm?

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Phylogenetic relationships between placozoans and sponges can best be determined by

Correct AnswerverifiedShow Answer

Animals appear to have evolved from a common ancestor.Which statement about the early evolution of animals is false?

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Refer to the figure. Ctenophores have no nervous system and are radially symmetrical.Which group shown in the figure shares a trait with the ctenophores?

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With a fixed amount of available energy, a female animal is restricted in the size and number of eggs she can produce.This is not consistent with which of the following statements?

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Animals that lack an enclosed body cavity, such as flatworms, are called _______.

Correct AnswerverifiedShow Answer

All of the following are necessary parts of a hydrostatic skeleton except

Correct AnswerverifiedShow Answer

Explain the fundamental difference between protostomes and deuterostomes.What evidence supports dividing organisms into these two groups?

Correct AnswerverifiedProtostomes and deuterostomes differ in ...View AnswerShow Answer

Refer to the table. Which characters have shared, derived character states for protostomes?

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Because all animals must take in nutrients from their environment, the nutritional mode of animals is called

Correct AnswerverifiedShow Answer

The terms "acoelomate," "pseudocoelomate," and "coelomate" refer to

Correct AnswerverifiedShow Answer

Sponges differ from other animals in that they

Correct AnswerverifiedShow Answer

Refer to the figure. Which statement concerning the medusa form of the jellyfish shown is false?

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Which statement concerning ctenophores (the comb jellies) is false?

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Which of the following structures is/are not involved with some mechanism of movement in animals?

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Refer to the figure. In the typical hydrozoan life cycle shown, identify the diploid and haploid stages, identify the processes occurring in the boxes (mitosis, meiosis, fertilization, or fusion), and label the identified structures.

Correct AnswerverifiedA. DiploidB. HaploidC. Medus...View AnswerShow Answer

Which of the following characteristics distinguishes deuterostomes from protostomes?

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Colonial animals differ from multicellular animals in that

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Protostomes and deuterostomes differ in ...
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A. Diploid
B. Haploid
C. Medus...
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