Question 1

Trichinella spiralis, the causative agent of the disease trichinosis, is a

Accepted Answer

A)  ribbon worm. 
B)  flatworm. 
C)  nematode. 
D)  rotifer. 
E)  annelid. 
A)  ribbon worm. 
B)  flatworm. 
C)  nematode. 
D)  rotifer. 
E)  annelid.

Question 2

Horsehair worms differ from the priapulids in that

Accepted Answer

A)  adult horsehair worms do not have a mouth opening. 
B)  horsehair worms do not have a larval stage. 
C)  horsehair worms are segmented. 
D)  horsehair worms do not molt. 
E)  there are no parasitic species of horsehair worms. 
A)  adult horsehair worms do not have a mouth opening. 
B)  horsehair worms do not have a larval stage. 
C)  horsehair worms are segmented. 
D)  horsehair worms do not molt. 
E)  there are no parasitic species of horsehair worms.

Question 3

Which of the following statements concerning nematodes is false?

Accepted Answer

A)  Parasitic nematodes infect many animal species, including humans and many domestic animals. 
B)  Parasitic nematodes infect many crop plants. 
C)  No nematode species is beneficial to humans. 
D)  Free-living nematodes are often extremely abundant. 
E)  The diet of nematodes is varied. 
A)  Parasitic nematodes infect many animal species, including humans and many domestic animals. 
B)  Parasitic nematodes infect many crop plants. 
C)  No nematode species is beneficial to humans. 
D)  Free-living nematodes are often extremely abundant. 
E)  The diet of nematodes is varied.

Question 4

Flatworms, nematodes, rotifers, annelids, and arthropods all display _______ symmetry.

Accepted Answer

The answer of Flatworms, nematodes, rotifers, annelids, and arthropods all...

Question 5

All protostomes

Accepted Answer

A)  form an anus from the blastopore. 
B)  have mesoderm. 
C)  form a mouth from the blastopore. 
D)  have a coelom. 
E)  have similar body plans. 
A)  form an anus from the blastopore. 
B)  have mesoderm. 
C)  form a mouth from the blastopore. 
D)  have a coelom. 
E)  have similar body plans.

Question 6

Trichinella is a parasitic _______.

Accepted Answer

The answer of Trichinella is a parasitic _______....

Question 7

Which of the features below does not describe the phoronids?

Accepted Answer

A)  Fewer than 100 species 
B)  Active forager and carnivorous 
C)  Secretion of chitinous tubes 
D)  Possession of a lophophore 
E)  Length ranging from 5 to 25 cm 
A)  Fewer than 100 species 
B)  Active forager and carnivorous 
C)  Secretion of chitinous tubes 
D)  Possession of a lophophore 
E)  Length ranging from 5 to 25 cm

Question 8

A typical crustacean larva is called a

Accepted Answer

A)  trochophore. 
B)  nauplius. 
C)  planula. 
D)  pupa. 
E)  caterpillar. 
A)  trochophore. 
B)  nauplius. 
C)  planula. 
D)  pupa. 
E)  caterpillar.

Question 9

The firm exoskeleton of insects has protective and supportive advantages, but it poses which of the following problems?

Accepted Answer

A)  The animal must consume large amounts of food to support the growth of the exoskeleton. 
B)  The exoskeleton prevents the animal from moving rapidly. 
C)  The exoskeleton cannot grow as the animal body inside it grows. 
D)  The exoskeleton attracts predators. 
E)  All of the above 
A)  The animal must consume large amounts of food to support the growth of the exoskeleton. 
B)  The exoskeleton prevents the animal from moving rapidly. 
C)  The exoskeleton cannot grow as the animal body inside it grows. 
D)  The exoskeleton attracts predators. 
E)  All of the above

Question 10

Which of the following groups includes the fewest species?

Accepted Answer

A)  Mollusks 
B)  Bryozoans 
C)  Arthropods 
D)  Nematodes 
E)  Lophotrochozoans 
A)  Mollusks 
B)  Bryozoans 
C)  Arthropods 
D)  Nematodes 
E)  Lophotrochozoans

Question 11

Which of the following statements about insect wings is false?

Accepted Answer

A)  The insect wing may have evolved from an ancestral appendage similar to that of modern crustaceans. 
B)  Development of the insect wing is governed by the expression of the same gene that governs the crayfish appendage. 
C)  Development of the insect wing and development of the crayfish appendage are controlled by the pdm gene. 
D)  The pdm gene is expressed in both the wings and legs of insects. 
E)  Appendages of ancestral crustaceans and wings of ancestral insects expressed the same gene (pdm). 
A)  The insect wing may have evolved from an ancestral appendage similar to that of modern crustaceans. 
B)  Development of the insect wing is governed by the expression of the same gene that governs the crayfish appendage. 
C)  Development of the insect wing and development of the crayfish appendage are controlled by the pdm gene. 
D)  The pdm gene is expressed in both the wings and legs of insects. 
E)  Appendages of ancestral crustaceans and wings of ancestral insects expressed the same gene (pdm).

Question 12

Which of the following statements about the flatworms is false?

Accepted Answer

A)  Some are parasitic. 
B)  They possess a mouth but no anus. 
C)  They are diploblastic. 
D)  They possess some degree of cephalization. 
E)  Some possess complex life cycles. 
A)  Some are parasitic. 
B)  They possess a mouth but no anus. 
C)  They are diploblastic. 
D)  They possess some degree of cephalization. 
E)  Some possess complex life cycles.

Question 13

Many crustacean species have a fold of exoskeleton called a _______ that extends dorsally and laterally from the head to cover and protect some body segments.

Accepted Answer

The answer of Many crustacean species have a fold of...

Question 14

Wings evolved _______ in protostomes.

Accepted Answer

A)  once 
B)  twice 
C)  three times 
D)  four times 
E)  many times, independently 
A)  once 
B)  twice 
C)  three times 
D)  four times 
E)  many times, independently

Question 15

Which of the following statements about spider webs and threads is false?

Accepted Answer

A)  The webs can function as a home. 
B)  The threads are produced by modified abdominal appendages connected to internal secretory glands. 
C)  The threads are composed primarily of carbohydrates. 
D)  The webs function as a snare for catching prey. 
E)  The threads provide safety lines for climbing. 
A)  The webs can function as a home. 
B)  The threads are produced by modified abdominal appendages connected to internal secretory glands. 
C)  The threads are composed primarily of carbohydrates. 
D)  The webs function as a snare for catching prey. 
E)  The threads provide safety lines for climbing.

Question 16

Which of the following insect groups consists of winged species that cannot fold their wings back over their bodies?

Accepted Answer

A)  Coleoptera (beetles) 
B)  Apterygota (silverfish and springtails) 
C)  Orthoptera (grasshoppers and their kin) 
D)  Odonata (dragonflies and damselflies) 
E)  None of the above 
A)  Coleoptera (beetles) 
B)  Apterygota (silverfish and springtails) 
C)  Orthoptera (grasshoppers and their kin) 
D)  Odonata (dragonflies and damselflies) 
E)  None of the above

Question 17

Spiral cleavage in early development

Accepted Answer

A)  is a synapomorphic trait in lophotrochozoans. 
B)  is a good trait to use for establishing evolutionary relationships among organisms. 
C)  occurs only in worm-like groups of lophotrochozoans. 
D)  occurs in mollusks. 
E)  always results in adult organisms that have similar body plans. 
A)  is a synapomorphic trait in lophotrochozoans. 
B)  is a good trait to use for establishing evolutionary relationships among organisms. 
C)  occurs only in worm-like groups of lophotrochozoans. 
D)  occurs in mollusks. 
E)  always results in adult organisms that have similar body plans.

Question 18

Which of the following have a specialized internal gas exchange system?

Accepted Answer

A)  Priapulids 
B)  Arrow worms 
C)  Hexapods 
D)  Horsehair worms 
E)  Annelids 
A)  Priapulids 
B)  Arrow worms 
C)  Hexapods 
D)  Horsehair worms 
E)  Annelids

Question 19

The lineage leading to the insects separated from the one leading to crustaceans around _______ million years ago.

Accepted Answer

The answer of The lineage leading to the insects separated...

Question 20

Flatworms are often parasitic. Which of the following is an adaptation found in flatworms that is associated with a parasitic lifestyle?

Accepted Answer

A)  Large size 
B)  A highly branched gastrovascular cavity 
C)  An oxygen transport system 
D)  Absorption of nutrients through the body surface 
E)  None of the above 
A)  Large size 
B)  A highly branched gastrovascular cavity 
C)  An oxygen transport system 
D)  Absorption of nutrients through the body surface 
E)  None of the above

Exam 32: Protostome Animals

Trichinella spiralis, the causative agent of the disease trichinosis, is a

Horsehair worms differ from the priapulids in that

Which of the following statements concerning nematodes is false?

Flatworms, nematodes, rotifers, annelids, and arthropods all display _______ symmetry.

All protostomes

Trichinella is a parasitic _______.

Which of the features below does not describe the phoronids?

A typical crustacean larva is called a

The firm exoskeleton of insects has protective and supportive advantages, but it poses which of the following problems?

Which of the following groups includes the fewest species?

Which of the following statements about insect wings is false?

Which of the following statements about the flatworms is false?

Many crustacean species have a fold of exoskeleton called a _______ that extends dorsally and laterally from the head to cover and protect some body segments.

Wings evolved _______ in protostomes.

Which of the following statements about spider webs and threads is false?

Which of the following insect groups consists of winged species that cannot fold their wings back over their bodies?

Spiral cleavage in early development

Which of the following have a specialized internal gas exchange system?

The lineage leading to the insects separated from the one leading to crustaceans around _______ million years ago.

Flatworms are often parasitic. Which of the following is an adaptation found in flatworms that is associated with a parasitic lifestyle?

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