Exam 32: Protostome Animals

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.

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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.

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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.

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

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

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

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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.

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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) .

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

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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.

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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

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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.

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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

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

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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

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