Question 1

Dibenzoylhydrazines are a category of molecules that have been used as insecticides.They work by blocking ecdysteroid receptors.How does this kill an insect?

Accepted Answer

A)  The insect can no longer excrete nitrogenous wastes.
B)  The insect cannot molt.
C)  The insect can no longer coordinate its movements.
D)  The chitinous exoskeleton is dissolved.

Question 2

All of the following are either structures or characteristics of members of the Class Bivalvia of the Phylum Mollusca except

Accepted Answer

A)  the mantle.
B)  a radula.
C)  a shell.
D)  gills.
E)  open circulation.

Question 3

Interoctopus communication is facilitated by

Accepted Answer

A)  a radula.
B)  mantle connections.
C)  chromatophores.
D)  chemical pheromones.

Question 4

According to the modern classification scheme,which animal would be a spider's closest relative?

Accepted Answer

A)  A snail
B)  An earthworm
C)  A tapeworm
D)  A roundworm
E)  A squid

Question 5

Which one of the following annelid structures or events is not correctly paired with its role in locomotion?

Accepted Answer

A)  circular muscles contract-segment becomes thin and long
B)  longitudinal muscles contract-segment becomes thick and short
C)  fluid in coelom-provides a hydrostatic skeleton
D)  septum-allows each segment to move independently
E)  chaetae-provides gas exchange surface for body muscles

Question 6

Annelids are characterized by serial ________.

Accepted Answer

Segmentati...

Question 7

Annelids possess all of the following except

Accepted Answer

A)  muscles to swim,crawl,and burrow.
B)  ganglia to respond to light and respond to other environmental cues.
C)  circulatory,excretory,and neural elements in each segment.
D)  setae in each segment.
E)  adductor muscles.

Question 8

Select the mismatched pair of Phylum Mollusca classes and their examples.

Accepted Answer

A)  Polyplacophora-chitons
B)  Gastropoda-slugs
C)  Bivalvia-snails
D)  Cephalopoda-nautilus
E)  Gastropoda-nudibranchs

Question 9

How would an earthworm stretch its body to reach a patch of dirt after crossing a hot sidewalk?

Accepted Answer

A)  Contraction of the circular muscles
B)  Contraction of the longitudinal muscles
C)  Relaxing the chaetae (setae) 
D)  Pulling on the chaetae (setae)

Question 10

Nauplius,a unique kind of larva,is characteristic of

Accepted Answer

A)  mites.
B)  crustaceans.
C)  horseshoe crabs.
D)  insects.
E)  chelicerates.

Question 11

A marine biologist visits your biology class and begins his talk entitled,"Life as a Trochophore." A friend seated next to you asks,"What is a trochophore?" You explain that a trochophore is

Accepted Answer

A)  another name for the veliger stage in earthworm reproduction.
B)  a term used to describe a larval form of either the phylum Mollusca or Annelida.
C)  another name for the veliger stage in the oyster.
D)  similar to a lophophore,but only found in the phylum Annelida.
E)  a parasite in the intestines of a bivalve mollusk.

Question 12

Which one of the following incorrectly matches a molluscan structure with its typical function?

Accepted Answer

A)  ctenidia-secretion of the shell (when present) 
B)  visceral mass-houses organs of digestion,excretion,reproduction
C)  foot-locomotion
D)  nephrostome-collection of nitrogenous wastes
E)  radula-feeding organ

Question 13

How does a ribbon worm differ from a flatworm?

Accepted Answer

A)  A flatworm has a complete digestive system.
B)  A ribbon worm has a mouth and an anus.
C)  Flatworms are deuterostomes.
D)  Flatworms are radially symmetrical and ribbon worms are bilaterally symmetrical.

Question 14

The passage of an arthropod through stages from egg to adult is

Accepted Answer

A)  differentiation.
B)  evolution.
C)  graduation.
D)  metamorphosis.
E)  succession.

Question 15

What change would result for a land snail that had a mutation interfering with chitin formation?

Accepted Answer

A)  It would have a soft,demineralized shell.
B)  It would have difficulty feeding.
C)  It could not form its exoskeleton.
D)  Molting would not be possible.

Question 16

In some arthropods tagmatization has produced a combination of head and thorax known as a

Accepted Answer

A)  cephalothorax.
B)  fused corpora.
C)  headless mite.
D)  larval instar.
E)  thoracotomy.

Question 17

At a celebratory dinner for a recent publication,a marine biologist ordered the lobster claw appetizer.What part did she order?

Accepted Answer

A)  Nauplius
B)  Telson
C)  Uropods
D)  Cheliped

Question 18

The rigid chitinous exoskeleton of an arthropod has all of the following functions except it

Accepted Answer

A)  provides a place for muscle attachment.
B)  protects the animal from predators.
C)  impedes water loss.
D)  maintains a uniform size for all individuals of that species.
E)  prevents injury to the animal.

Question 19

In their basic body plan,mollusks have a visceral mass covered with a soft epithelium and a muscular ________ that is used in locomotion.

Accepted Answer

The answer of In their basic body plan,mollusks have a...

Question 20

Eyes with single lenses that respond to light and darkness are found in many arthropods; these are the

Accepted Answer

A)  compound eyes.
B)  ocelli.
C)  apposition eyes.
D)  ommatidia.
E)  superposition segments.

Exam 33: Protostomes

Annelids possess all of the following except

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In some arthropods tagmatization has produced a combination of head and thorax known as a

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The passage of an arthropod through stages from egg to adult is

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According to the modern classification scheme,which animal would be a spider's closest relative?

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How does a ribbon worm differ from a flatworm?

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In their basic body plan,mollusks have a visceral mass covered with a soft epithelium and a muscular ________ that is used in locomotion.

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Nauplius,a unique kind of larva,is characteristic of

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Interoctopus communication is facilitated by

Correct AnswerverifiedShow Answer

Eyes with single lenses that respond to light and darkness are found in many arthropods; these are the

Correct AnswerverifiedShow Answer

At a celebratory dinner for a recent publication,a marine biologist ordered the lobster claw appetizer.What part did she order?

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Which one of the following incorrectly matches a molluscan structure with its typical function?

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What change would result for a land snail that had a mutation interfering with chitin formation?

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A marine biologist visits your biology class and begins his talk entitled,"Life as a Trochophore." A friend seated next to you asks,"What is a trochophore?" You explain that a trochophore is

Correct AnswerverifiedShow Answer

Dibenzoylhydrazines are a category of molecules that have been used as insecticides.They work by blocking ecdysteroid receptors.How does this kill an insect?

Correct AnswerverifiedShow Answer

Annelids are characterized by serial ________.

Correct AnswerverifiedSegmentati...View AnswerShow Answer

Which one of the following annelid structures or events is not correctly paired with its role in locomotion?

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Select the mismatched pair of Phylum Mollusca classes and their examples.

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The rigid chitinous exoskeleton of an arthropod has all of the following functions except it

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How would an earthworm stretch its body to reach a patch of dirt after crossing a hot sidewalk?

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All of the following are either structures or characteristics of members of the Class Bivalvia of the Phylum Mollusca except

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Segmentati...
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