Question 1

Two outwardly dissimilar groups,the ________ and the chordates,together with a few other small phyla,constitute the deuterostomes.

Accepted Answer

The answer of Two outwardly dissimilar groups,the ________ and the...

Question 2

Of the following combination of statements about protostomes and deuterostomes,which choice is correct?

Accepted Answer

A)  Protostomes are animals in which the mouth develops from the blastopore,and the anus or anal pore develops from the second opening.Deuterostomes are animals in which the anus develops from the blastopore and the mouth develops secondarily later in their development.
B)  Protostomes are animals in which the anus develops from the blastopore,and the mouth develops from the second opening.Deuterostomes are animals in which the anus develops from the blastopore and the mouth develops secondarily later in their development.
C)  Protostomes are animals in which the mouth develops from the blastopore,and the anus or anal pore develops from the second opening.Deuterostomes are animals in which the mouth develops from the blastopore and the anus develops secondarily later in their development.
D)  Protostomes are animals in which the mouth or anus develops from the blastopore,depending on the species.Deuterostomes are animals in which the mouth and anus develops from the blastopore,depending on the species.E) None of the above
F) All of the above

Question 3

In all deuterostomes,the cells divide parallel to and at right angles to the polar axis.This pattern is called ________.

Accepted Answer

The answer of In all deuterostomes,the cells divide parallel to...

Question 4

Select the phylum that includes deuterostome animals that are exclusively marine and have radial symmetry as adults.

Accepted Answer

A)  Porifera
B)  Rotifera
C)  Echinodermata
D)  Chordata
E)  CnidariaF) B) and D)
G) None of the above

Question 5

Protostomes develop through

Accepted Answer

A)  spiral cleavage.
B)  radial cleavage.
C)  axial cleavage.
D)  polar cleavage.
E)  protocleavage.F) B) and D)
G) A) and D)

Question 6

Which one of the following terms applies to the phylum Mollusca?

Accepted Answer

A)  protostome
B)  pseudocoelomate
C)  Parazoa
D)  diploblastic
E)  asymmetryF) All of the above
G) C) and E)

Question 7

Which one of the following terms applies to the phylum Arthropoda?

Accepted Answer

A)  radial symmetry
B)  diploblastic
C)  coelomate
D)  Parazoa
E)  deuterostomeF) B) and C)
G) D) and E)

Question 8

Which one of the following applies to the phylum Ctenophora?

Accepted Answer

A)  often bioluminescent marine animals
B)  protostome
C)  coelomate
D)  deuterostome
E)  ParazoaF) B) and C)
G) All of the above

Question 9

Animals with a body cavity located between the mesoderm and endoderm are ________.

Accepted Answer

The answer of Animals with a body cavity located between...

Question 10

Select the following phylum that includes animals that are unsegmented,acoelomate,and have a digestive cavity with a single opening.

Accepted Answer

A)  Annelida
B)  Platyhelminthes
C)  Nematoda
D)  Cnidaria
E)  RotiferaF) A) and D)
G) C) and D)

Question 11

Parazoa

Accepted Answer

A)  are pseudocoelomates.
B)  exhibit bilateral symmetry.
C)  include Cnidaria and Ctenophora.
D)  exhibit primitive segmentation.
E)  have no true tissues.F) A) and B)
G) A) and C)

Question 12

The embryonic layer found only in bilaterally symmetrical eumetazoans is the ________.

Accepted Answer

The answer of The embryonic layer found only in bilaterally...

Question 13

Touching a jellyfish can be a very painful experience whereas touching a comb jelly is not painful.Why is there a difference?

Accepted Answer

A)  Nematocysts in ctenophores lack venom.
B)  Ctenophores have very reduced nematocysts that cannot penetrate human skin.
C)  Ctenphores do not possess nematocysts.
D)  Ctenophores only use nematocycts for feeding,not for defense.E) A) and C)
F) B) and C)

Question 14

A scientist is studying some developing eggs from an ocean sample.The early embryos have divided only a few times,and all cells look identical.When the scientist carefully removes half the cells from an embryo,both clumps of cells are able to complete development,forming twins.The eggs can be identified as

Accepted Answer

A)  deuterostomes.
B)  protostomes.
C)  crustaceans.
D)  cnidarians.
E)  echinoderms.F) B) and E)
G) A) and B)

Question 15

Select the following phylum that includes protostome animals that are segmented,bilaterally symmetric,and have a chitinous exoskeleton.

Accepted Answer

A)  Arthropoda
B)  Annelida
C)  Mollusca
D)  Brachiopoda
E)  PlatyhelminthesF) C) and D)
G) B) and C)

Question 16

What are the three animal phyla that dominate animal life on land?

Accepted Answer

A)  Cnidaria,Mollusca,Platyhelminthes
B)  Porifera,Arthropoda,Nematoda
C)  Nematoda,Chordata,Cnidaria
D)  Mollusca,Arthropoda,Chordata
E)  Platyhelminthes,Nematoda,ArthropodaF) A) and B)
G) All of the above

Question 17

Molecular data confirm that cnidarians branched off from the rest of animals before ________ evolved.

Accepted Answer

A)  echinoderms
B)  Porifera
C)  mollusks
D)  bilateral symmetry
E)  arthropodsF) A) and E)
G) A) and B)

Question 18

Eumetazoa can be subdivided into two principal branches based on ________.

Accepted Answer

The answer of Eumetazoa can be subdivided into two principal...

Question 19

How could a biologist distinguish an acoel flatworm from a free living platyhelminth?

Accepted Answer

A)  The acoel worm would be solid throughout,since it lacks a gut.
B)  The acoel worm would have a nervous system.
C)  The platyhelminth would have a more primitive gut and nervous system.
D)  Only the acoel is triploblastic.E) None of the above
F) A) and B)

Question 20

In a ________ circulatory system,circulation of blood is more controlled-the blood is moved faster and more efficiently than in other types of circulatory systems.

Accepted Answer

The answer of In a ________ circulatory system,circulation of blood...

Exam 32: Animal Diversity and the Evolution of Body Plans

Molecular data confirm that cnidarians branched off from the rest of animals before ________ evolved.

Correct Answer
verified

How could a biologist distinguish an acoel flatworm from a free living platyhelminth?

Correct Answer
verified

The embryonic layer found only in bilaterally symmetrical eumetazoans is the ________.

Correct Answer
verified

Parazoa

Correct Answer
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Which one of the following applies to the phylum Ctenophora?

Correct Answer
verified

Of the following combination of statements about protostomes and deuterostomes,which choice is correct?

Correct Answer
verified

Animals with a body cavity located between the mesoderm and endoderm are ________.

Correct Answer
verified

Select the phylum that includes deuterostome animals that are exclusively marine and have radial symmetry as adults.

Correct Answer
verified

Which one of the following terms applies to the phylum Mollusca?

Correct Answer
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Protostomes develop through

Correct Answer
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Eumetazoa can be subdivided into two principal branches based on ________.

Correct Answer
verified

In all deuterostomes,the cells divide parallel to and at right angles to the polar axis.This pattern is called ________.

Correct Answer
verified

In a ________ circulatory system,circulation of blood is more controlled-the blood is moved faster and more efficiently than in other types of circulatory systems.

Correct Answer
verified

Correct Answer
verified

Touching a jellyfish can be a very painful experience whereas touching a comb jelly is not painful.Why is there a difference?

Correct Answer
verified

Select the following phylum that includes protostome animals that are segmented,bilaterally symmetric,and have a chitinous exoskeleton.

Correct Answer
verified

Two outwardly dissimilar groups,the ________ and the chordates,together with a few other small phyla,constitute the deuterostomes.

Correct Answer
verified

What are the three animal phyla that dominate animal life on land?

Correct Answer
verified

Which one of the following terms applies to the phylum Arthropoda?

Correct Answer
verified

Select the following phylum that includes animals that are unsegmented,acoelomate,and have a digestive cavity with a single opening.

Correct Answer
verified

Exam 32: Animal Diversity and the Evolution of Body Plans

Molecular data confirm that cnidarians branched off from the rest of animals before ________ evolved.

Correct AnswerverifiedShow Answer

How could a biologist distinguish an acoel flatworm from a free living platyhelminth?

Correct AnswerverifiedShow Answer

The embryonic layer found only in bilaterally symmetrical eumetazoans is the ________.

Correct AnswerverifiedShow Answer

Parazoa

Correct AnswerverifiedShow Answer

Which one of the following applies to the phylum Ctenophora?

Correct AnswerverifiedShow Answer

Of the following combination of statements about protostomes and deuterostomes,which choice is correct?

Correct AnswerverifiedShow Answer

Animals with a body cavity located between the mesoderm and endoderm are ________.

Correct AnswerverifiedShow Answer

Select the phylum that includes deuterostome animals that are exclusively marine and have radial symmetry as adults.

Correct AnswerverifiedShow Answer

Which one of the following terms applies to the phylum Mollusca?

Correct AnswerverifiedShow Answer

Protostomes develop through

Correct AnswerverifiedShow Answer

Eumetazoa can be subdivided into two principal branches based on ________.

Correct AnswerverifiedShow Answer

In all deuterostomes,the cells divide parallel to and at right angles to the polar axis.This pattern is called ________.

Correct AnswerverifiedShow Answer

In a ________ circulatory system,circulation of blood is more controlled-the blood is moved faster and more efficiently than in other types of circulatory systems.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Touching a jellyfish can be a very painful experience whereas touching a comb jelly is not painful.Why is there a difference?

Correct AnswerverifiedShow Answer

Select the following phylum that includes protostome animals that are segmented,bilaterally symmetric,and have a chitinous exoskeleton.

Correct AnswerverifiedShow Answer

Two outwardly dissimilar groups,the ________ and the chordates,together with a few other small phyla,constitute the deuterostomes.

Correct AnswerverifiedShow Answer

What are the three animal phyla that dominate animal life on land?

Correct AnswerverifiedShow Answer

Which one of the following terms applies to the phylum Arthropoda?

Correct AnswerverifiedShow Answer

Select the following phylum that includes animals that are unsegmented,acoelomate,and have a digestive cavity with a single opening.

Correct AnswerverifiedShow Answer

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