Question 1

Adult ascidian tunicates have

Accepted Answer

A)  a notochord.
B)  pharyngeal slits.
C)  a dorsal heart.
D)  a nerve cord and the beginning of an advanced brain.
E)  all of the choices are adult ascidian features.

Question 2

Usually we think of evolution acting on organisms with different structures.How could evolution select the developmental pattern seen in paedomorphosis?

Accepted Answer

Evolution can select for the development...

Question 3

What feature(s) can be found in the ammocoete that are lacking in amphioxus,that are found in vertebrates?

Accepted Answer

A)  A true liver with a gallbladder
B)  A two-chambered heart
C)  A three-part brain
D)  Eyes,nostrils,and auditory vesicles
E)  All of the choices are ammocoete features lacking in the amphioxus lancelet

Question 4

Walter Garstang's hypothesis of vertebrate evolution could be described as the

Accepted Answer

A)  annelid-vertebrate hypothesis.
B)  echinoderm-vertebrate hypothesis.
C)  amphioxus-vertebrate hypothesis.
D)  ascidian larva-vertebrate hypothesis.
E)  ammocoete larva-vertebrate hypothesis.

Question 5

The lancelets or Branchiostoma are found

Accepted Answer

A)  very rarely and are about extinct.
B)  as parasites inside the tracts of fish.
C)  commonly in the sandy bottoms of coastal waters around the world.
D)  in tropical freshwater streams.
E)  near deep ocean thermal vents.

Question 6

The early vertebrate fossils belong to an extinct group of jawless fishes known as ____________.

Accepted Answer

The answer of The early vertebrate fossils belong to an...

Question 7

Are the jawless ostracoderms a real taxon (that is,are they a monophyletic group)?

Accepted Answer

Ostracoderms are an extinct group of jaw...

Question 8

Outline the five chordate features.What is the fate of the endostyle in the higher vertebrates?

Accepted Answer

The five chordate features are key chara...

Question 9

The lancelet reproduces

Accepted Answer

A)  by asexual processes alone.
B)  by budding.
C)  sexually with both sex organs on the same organism,similar to earthworms.
D)  sexually but with separate sexes and internal fertilization.
E)  sexually but with separate sexes and external fertilization.

Question 10

The urochordates are enclosed in a nonliving cellulose-containing structure called a _________ or test.

Accepted Answer

The answer of The urochordates are enclosed in a nonliving...

Question 11

One overriding advantage of the endoskeleton of vertebrates,as compared to the invertebrate exoskeleton is that it permits __________ without the necessity of molting.

Accepted Answer

The answer of One overriding advantage of the endoskeleton of...

Question 12

Organisms that retain the larval form of their evolutionary ancestors when they are sexually mature are called

Accepted Answer

A)  Larviparous.
B)  Paedomorphic.
C)  Nymphogenic.
D)  Precocial.

Question 13

Larval and adult tunicates look virtually nothing alike.How can you explain this dramatic metamorphosis in evolutionary terms?

Accepted Answer

The dramatic metamorphosis from larval t...

Question 14

Cephalochordates

Accepted Answer

A)  are small fish-like,freshwater animals.
B)  have a notochord only in their immature stage.
C)  digest food in a hepatic cecum or liver diverticulum.
D)  have a ventral nerve cord.
E)  have a heart that circulates blood cells with hemoglobin in a closed system.

Question 15

Of the five chordate hallmarks,adult tunicates have only two,the _______ _______ and the endostyle.

Accepted Answer

The answer of Of the five chordate hallmarks,adult tunicates have...

Question 16

In the chordates,the __________ forms in the vicinity of the embryological blastopore.

Accepted Answer

The answer of In the chordates,the __________ forms in the...

Question 17

The characteristics of the chordates and the characteristics of the vertebrates are not the same.List the features that distinguish these two groups.

Accepted Answer

Chordates are a group of animals that po...

Exam 23: Chordates

Organisms that retain the larval form of their evolutionary ancestors when they are sexually mature are called

Correct Answer
verified

Larval and adult tunicates look virtually nothing alike.How can you explain this dramatic metamorphosis in evolutionary terms?

Correct Answer
Answered by ExamLex AI
The dramatic metamorphosis from larval t...
View Answer

Of the five chordate hallmarks,adult tunicates have only two,the _ _ and the endostyle.

Correct Answer
verified

Usually we think of evolution acting on organisms with different structures.How could evolution select the developmental pattern seen in paedomorphosis?

Correct Answer
Answered by ExamLex AI
Evolution can select for the development...
View Answer

In the chordates,the __________ forms in the vicinity of the embryological blastopore.

Correct Answer
verified

The lancelet reproduces

Correct Answer
verified

Outline the five chordate features.What is the fate of the endostyle in the higher vertebrates?

Correct Answer
Answered by ExamLex AI
The five chordate features are key chara...
View Answer

The characteristics of the chordates and the characteristics of the vertebrates are not the same.List the features that distinguish these two groups.

Correct Answer
Answered by ExamLex AI
Chordates are a group of animals that po...
View Answer

Are the jawless ostracoderms a real taxon (that is,are they a monophyletic group)?

Correct Answer
Answered by ExamLex AI
Ostracoderms are an extinct group of jaw...
View Answer

The early vertebrate fossils belong to an extinct group of jawless fishes known as ____________.

Correct Answer
verified

Adult ascidian tunicates have

Correct Answer
verified

Cephalochordates

Correct Answer
verified

One overriding advantage of the endoskeleton of vertebrates,as compared to the invertebrate exoskeleton is that it permits __________ without the necessity of molting.

Correct Answer
verified

What feature(s) can be found in the ammocoete that are lacking in amphioxus,that are found in vertebrates?

Correct Answer
verified

The urochordates are enclosed in a nonliving cellulose-containing structure called a _________ or test.

Correct Answer
verified

The lancelets or Branchiostoma are found

Correct Answer
verified

Walter Garstang's hypothesis of vertebrate evolution could be described as the

Correct Answer
verified

Exam 23: Chordates

Organisms that retain the larval form of their evolutionary ancestors when they are sexually mature are called

Correct AnswerverifiedShow Answer

Larval and adult tunicates look virtually nothing alike.How can you explain this dramatic metamorphosis in evolutionary terms?

Correct AnswerAnswered by ExamLex AIThe dramatic metamorphosis from larval t...View AnswerShow Answer

Of the five chordate hallmarks,adult tunicates have only two,the _______ _______ and the endostyle.

Correct AnswerverifiedShow Answer

Usually we think of evolution acting on organisms with different structures.How could evolution select the developmental pattern seen in paedomorphosis?

Correct AnswerAnswered by ExamLex AIEvolution can select for the development...View AnswerShow Answer

In the chordates,the __________ forms in the vicinity of the embryological blastopore.

Correct AnswerverifiedShow Answer

The lancelet reproduces

Correct AnswerverifiedShow Answer

Outline the five chordate features.What is the fate of the endostyle in the higher vertebrates?

Correct AnswerAnswered by ExamLex AIThe five chordate features are key chara...View AnswerShow Answer

The characteristics of the chordates and the characteristics of the vertebrates are not the same.List the features that distinguish these two groups.

Correct AnswerAnswered by ExamLex AIChordates are a group of animals that po...View AnswerShow Answer

Are the jawless ostracoderms a real taxon (that is,are they a monophyletic group)?

Correct AnswerAnswered by ExamLex AIOstracoderms are an extinct group of jaw...View AnswerShow Answer

The early vertebrate fossils belong to an extinct group of jawless fishes known as ____________.

Correct AnswerverifiedShow Answer

Adult ascidian tunicates have

Correct AnswerverifiedShow Answer

Cephalochordates

Correct AnswerverifiedShow Answer

One overriding advantage of the endoskeleton of vertebrates,as compared to the invertebrate exoskeleton is that it permits __________ without the necessity of molting.

Correct AnswerverifiedShow Answer

What feature(s) can be found in the ammocoete that are lacking in amphioxus,that are found in vertebrates?

Correct AnswerverifiedShow Answer

The urochordates are enclosed in a nonliving cellulose-containing structure called a _________ or test.

Correct AnswerverifiedShow Answer

The lancelets or Branchiostoma are found

Correct AnswerverifiedShow Answer

Walter Garstang's hypothesis of vertebrate evolution could be described as the

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
The dramatic metamorphosis from larval t...
View Answer

Of the five chordate hallmarks,adult tunicates have only two,the _ _ and the endostyle.

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
Evolution can select for the development...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
The five chordate features are key chara...
View Answer

Correct Answer
Answered by ExamLex AI
Chordates are a group of animals that po...
View Answer

Correct Answer
Answered by ExamLex AI
Ostracoderms are an extinct group of jaw...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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