Question 1

The development of a new vertebrate head was largely the result of two embryonic innovations: the neural crest and _________ ___________.

Accepted Answer

The answer of The development of a new vertebrate head...

Question 2

While several invertebrate groups (phyla)have in the past been proposed as chordate ancestors,embryological evidence indicates the chordates are most probably a sister group to the _____________.

Accepted Answer

The answer of While several invertebrate groups (phyla)have in the...

Question 3

Outline the process that may explain how vertebrates evolved jaws.Be sure to discuss Meckel's cartilage and the significance of that structure.

Accepted Answer

The evolution of jaws in vertebrates is ...

Question 4

The ostracoderms

Accepted Answer

A)  are the adult form of the ammocoete.
B)  were the first vertebrate to have jaws.
C)  are an extinct group of heavily armored,jawless fish.
D)  were the first fish with paired fins that led to paired appendages.
E)  were the first jawed animals.F) A) and D)
G) A) and C)

Question 5

Lancelets belong to the subphylum __________.

Accepted Answer

The answer of Lancelets belong to the subphylum __________....

Question 6

A notochord is most correctly defined as

Accepted Answer

A)  a primitive spine.
B)  the tissue that becomes the dorsal nerve.
C)  a flexible stiffening rod extending the length of the body.
D)  embryonic tissue that develops into bone and cartilage.
E)  any tissue that functions in the role of a dorsal tubular nerve cord.F) A) and B)
G) A) and C)

Question 7

The closest model for the vertebrate ancestral stock is something similar to the _______ _______.

Accepted Answer

The answer of The closest model for the vertebrate ancestral...

Question 8

The name Urochordata means literally

Accepted Answer

A)  "tail chordates."
B)  "head chordates."
C)  "kidney chordates."
D)  "tunic chordates."
E)  "larval swimmer."F) B) and E)
G) B) and D)

Question 9

Appendicularians

Accepted Answer

A)  are sexually mature individuals that have retained the larval body form.
B)  are pelagic.
C)  build a delicate,transparent,and hollow sphere of mucus to trap food.
D)  replace feeding houses every 3-4 hours.
E)  All of the choices are correct.F) A) and D)
G) B) and D)

Question 10

In both tunicates and cephalochordates,the ventral side of the branchial sac contains a ciliated,mucus-secreting groove,the ____________.

Accepted Answer

The answer of In both tunicates and cephalochordates,the ventral side...

Question 11

The perforated pharynx of chordates first evolved as a device for

Accepted Answer

A)  support.
B)  respiration.
C)  suspension or filter feeding.
D)  detecting odors.
E)  All of the choices are correct.F) B) and E)
G) A) and E)

Question 12

The skeletal rod found in all chordates is called a _________.

Accepted Answer

The answer of The skeletal rod found in all chordates...

Question 13

Pikaia gracilens,the earliest known chordate collected from the Burgess Shale of British Columbia,closely resembles

Accepted Answer

A)  the amphioxus lancelet.
B)  living sessile tunicates.
C)  the ammocoete larva.
D)  an adult larvacean.
E)  the lamprey.F) None of the above
G) B) and C)

Question 14

The ammocoete larvae is important in zoology since it

Accepted Answer

A)  is the "missing link" between chordates and vertebrates.
B)  represents the features of the most advanced chordate that is not a vertebrate.
C)  represents the features of the first vertebrates that are not obscured by advanced vertebrate development.
D)  is identical to the earliest Burgess shale fossil vertebrate.
E)  possesses all features found in derived vertebrates,and evolution from this point forward was a matter of losing different features.F) B) and E)
G) B) and D)

Question 15

"Sea squirts," the most common kind of tunicate,belong to the class ___________.

Accepted Answer

The answer of "Sea squirts," the most common kind of...

Question 16

One example of why a cladist is not satisfied with the traditional classification scheme is because it

Accepted Answer

A)  includes too many levels of classification.
B)  includes humans among the mammals.
C)  includes birds with the reptiles.
D)  does not include birds with the reptiles.E) B) and C)
F) A) and D)

Question 17

Although several invertebrate groups have been proposed as chordate ancestors,most zoologists now believe the embryological evidence indicates the chordates have probably descended from ancestors nearest the ___________ lineage.

Accepted Answer

A)  Arthropoda
B)  Cnidaria
C)  Annelida-Mollusca
D)  Lophophorate
E)  EchinodermataF) A) and B)
G) A) and C)

Question 18

Explain why fossil specimens of Haikouella lanceolata offer many clues to understanding the evolution of vertebrates from cephalochordates.

Accepted Answer

Fossil specimens of Haikouella lanceolat...

Question 19

All chordates have

Accepted Answer

A)  a single,dorsal,tubular,nerve cord.
B)  a ventral heart.
C)  pharyngeal slits.
D)  a postanal tail as some stage.
E)  all of the choices are chordate features.F) C) and D)
G) None of the above

Question 20

Unlike most invertebrate phyla,the nerve cord of chordates is single,tubular,and located ___________ to the alimentary canal.

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The answer of Unlike most invertebrate phyla,the nerve cord of...

Exam 23: Chordates

The ostracoderms

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Explain why fossil specimens of Haikouella lanceolata offer many clues to understanding the evolution of vertebrates from cephalochordates.

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Lancelets belong to the subphylum __________.

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The ammocoete larvae is important in zoology since it

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Pikaia gracilens,the earliest known chordate collected from the Burgess Shale of British Columbia,closely resembles

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One example of why a cladist is not satisfied with the traditional classification scheme is because it

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Outline the process that may explain how vertebrates evolved jaws.Be sure to discuss Meckel's cartilage and the significance of that structure.

Correct AnswerAnswered by ExamLex AIThe evolution of jaws in vertebrates is ...View AnswerShow Answer

The closest model for the vertebrate ancestral stock is something similar to the _______ _______.

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"Sea squirts," the most common kind of tunicate,belong to the class ___________.

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The name Urochordata means literally

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In both tunicates and cephalochordates,the ventral side of the branchial sac contains a ciliated,mucus-secreting groove,the ____________.

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Although several invertebrate groups have been proposed as chordate ancestors,most zoologists now believe the embryological evidence indicates the chordates have probably descended from ancestors nearest the ___________ lineage.

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The perforated pharynx of chordates first evolved as a device for

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All chordates have

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Unlike most invertebrate phyla,the nerve cord of chordates is single,tubular,and located ___________ to the alimentary canal.

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A notochord is most correctly defined as

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While several invertebrate groups (phyla)have in the past been proposed as chordate ancestors,embryological evidence indicates the chordates are most probably a sister group to the _____________.

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The skeletal rod found in all chordates is called a _________.

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The development of a new vertebrate head was largely the result of two embryonic innovations: the neural crest and _________ ___________.

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Appendicularians

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Fossil specimens of Haikouella lanceolat...
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The evolution of jaws in vertebrates is ...
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The closest model for the vertebrate ancestral stock is something similar to the _ _.

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The development of a new vertebrate head was largely the result of two embryonic innovations: the neural crest and _ ___.

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