Question 1

Nautiluses are unique among living cephalopods in that they have

Accepted Answer

A)  an excurrent siphon. 
B)  eyes that are comparable to vertebrate eyes. 
C)  an incurrent siphon. 
D)  a chambered shell. 
E)  tentacles. 
A)  an excurrent siphon. 
B)  eyes that are comparable to vertebrate eyes. 
C)  an incurrent siphon. 
D)  a chambered shell. 
E)  tentacles.

Question 2

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

Accepted Answer

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

Question 3

Refer to the figure showing an annelid segment cross and longitudinal section.   Label the lettered structures with the following: blood vessel, intestine, circular muscle, longitudinal muscle, setae (bristles), septum between segments, nerve cord, coelom, and excretory organ.Identify the primary structures that would allow the annelid to move through a terrestrial environment.

Accepted Answer

A: septum between segments
B: circular m

Question 4

The immature stages of insects between molts are called _______.

Accepted Answer

The answer of The immature stages of insects between molts...

Question 5

Which statement about rotifers is false?

Accepted Answer

A)  They are acoelomates. 
B)  Their body cavity functions as a hydrostatic skeleton. 
C)  They locomote through the water by means of beating cilia. 
D)  Most species are smaller than some ciliate protists. 
E)  They have specialized internal organs. 
A)  They are acoelomates. 
B)  Their body cavity functions as a hydrostatic skeleton. 
C)  They locomote through the water by means of beating cilia. 
D)  Most species are smaller than some ciliate protists. 
E)  They have specialized internal organs.

Question 6

Which statement about the nematode (roundworm) group is false?

Accepted Answer

A)  It has the fewest species of all the protostome groups. 
B)  Different nematode species are scavengers in the upper layers of the soil, on the bottoms of lakes and streams, and in marine sediments. 
C)  Large numbers of individual nematodes occur in the topsoil of rich farmland. 
D)  Nematodes can be found in large numbers in rotting fruit. 
E)  Nematodes are surrounded by a cuticle that they must shed to grow. 
A)  It has the fewest species of all the protostome groups. 
B)  Different nematode species are scavengers in the upper layers of the soil, on the bottoms of lakes and streams, and in marine sediments. 
C)  Large numbers of individual nematodes occur in the topsoil of rich farmland. 
D)  Nematodes can be found in large numbers in rotting fruit. 
E)  Nematodes are surrounded by a cuticle that they must shed to grow.

Question 7

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)  It keeps the animal from moving rapidly. 
C)  It cannot grow as the animal body inside it grows. 
D)  It attracts predators. 
E)  It accumulates toxins produced by metabolism. 
A)  The animal must consume large amounts of food to support the growth of the exoskeleton. 
B)  It keeps the animal from moving rapidly. 
C)  It cannot grow as the animal body inside it grows. 
D)  It attracts predators. 
E)  It accumulates toxins produced by metabolism.

Question 8

Only females are known among the bdelloid rotifers, and they are thought to have existed tens of millions of years without regular sexual reproduction.Long-term asexual reproduction typically leads to extinction.What are some of the drawbacks of long-term asexual reproduction? How have bdelloid rotifers been able to avoid this problem?

Accepted Answer

Without genetic recombination through se

Question 9

Nematode diversity is important to ecosystems because

Accepted Answer

A)  parasitic nematodes regulate other animal population sizes. 
B)  nematodes represent half of all animal biomass. 
C)  nematodes represent an important food source for other animals. 
D)  nematodes are important in nutrient cycling. 
E)  parasitic nematodes detoxify their hosts. 
A)  parasitic nematodes regulate other animal population sizes. 
B)  nematodes represent half of all animal biomass. 
C)  nematodes represent an important food source for other animals. 
D)  nematodes are important in nutrient cycling. 
E)  parasitic nematodes detoxify their hosts.

Question 10

Arthropods have a rigid exoskeleton that prevents wormlike movement; instead, they move using _______ that are manipulated by muscles.

Accepted Answer

The answer of Arthropods have a rigid exoskeleton that prevents...

Question 11

Refer to the figure showing an arthropod exoskeleton.   Which structure is/are common to arthropods and annelids?

Accepted Answer

A)  Ventral nerve cord 
B)  Muscles within appendage 
C)  Hemocoel 
D)  Exoskeleton 
E)  Muscles that move appendages 
A)  Ventral nerve cord 
B)  Muscles within appendage 
C)  Hemocoel 
D)  Exoskeleton 
E)  Muscles that move appendages

Question 12

In many endoparasitic flatworms, most of the body is

Accepted Answer

A)  made up of the digestive tract. 
B)  devoted to reproductive structures. 
C)  made up of gas exchange structures. 
D)  made up of the coelom. 
E)  covered by a cuticle. 
A)  made up of the digestive tract. 
B)  devoted to reproductive structures. 
C)  made up of gas exchange structures. 
D)  made up of the coelom. 
E)  covered by a cuticle.

Question 13

_______ insects, a subgroup of the _______ insects, undergo _______ metamorphosis.

Accepted Answer

A)  Neopteran; pterygote; complete 
B)  Holometabolous; neopteran; complete 
C)  Neopteran; holometabolous; incomplete 
D)  Holometabolous; neopteran; incomplete 
E)  Neopteran; holometabolous; complete 
A)  Neopteran; pterygote; complete 
B)  Holometabolous; neopteran; complete 
C)  Neopteran; holometabolous; incomplete 
D)  Holometabolous; neopteran; incomplete 
E)  Neopteran; holometabolous; complete

Question 14

Which of the following are not members of the annelid group?

Accepted Answer

A)  Bryozoans 
B)  Polychaetes 
C)  Oligochaetes 
D)  Clitellates 
E)  Leeches 
A)  Bryozoans 
B)  Polychaetes 
C)  Oligochaetes 
D)  Clitellates 
E)  Leeches

Question 15

Arthropods were able to transition from aquatic to terrestrial environments due to a _______.

Accepted Answer

chitinous

Question 16

Some cephalopods have a modified excurrent siphon and mantle to allow them to

Accepted Answer

A)  ingest large prey. 
B)  alter their buoyancy. 
C)  move rapidly through the water. 
D)  attach to a substrate. 
E)  become parasitic. 
A)  ingest large prey. 
B)  alter their buoyancy. 
C)  move rapidly through the water. 
D)  attach to a substrate. 
E)  become parasitic.

Question 17

Refer to the figure showing a nudibranch.   Nudibranchs are poisonous.The bright colors of the upper side of the body

Accepted Answer

A)  imitate a shell. 
B)  resemble a poisonous plant. 
C)  warn predators. 
D)  provide camouflage. 
E)  are specials area for gas exchange. 
A)  imitate a shell. 
B)  resemble a poisonous plant. 
C)  warn predators. 
D)  provide camouflage. 
E)  are specials area for gas exchange.

Question 18

A very small animal (about 0.5‒1.5 mm in length) with fleshy, unjointed legs that lives in marine sand is most likely a(n)

Accepted Answer

A)  tardigrade. 
B)  onychophoran. 
C)  chelicerate. 
D)  crustacean. 
E)  hexapod. 
A)  tardigrade. 
B)  onychophoran. 
C)  chelicerate. 
D)  crustacean. 
E)  hexapod.

Question 19

In flatworms, the advantage a dorsoventrally flattened body is that it allows them to

Accepted Answer

A)  hide from predators. 
B)  move quickly through the environment. 
C)  meet their gas exchange requirements without a transport system. 
D)  grow to very large sizes. 
E)  filter-feed. 
A)  hide from predators. 
B)  move quickly through the environment. 
C)  meet their gas exchange requirements without a transport system. 
D)  grow to very large sizes. 
E)  filter-feed.

Question 20

Both rotifers and flatworms possess

Accepted Answer

A)  a complete digestive tract. 
B)  a dorsoventrally flattened body. 
C)  two simple eyes and a tiny brain. 
D)  gonads. 
E)  a ciliated corona. 
A)  a complete digestive tract. 
B)  a dorsoventrally flattened body. 
C)  two simple eyes and a tiny brain. 
D)  gonads. 
E)  a ciliated corona.

Exam 31: Protostome Animals

Nautiluses are unique among living cephalopods in that they have

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

The immature stages of insects between molts are called _______.

Which statement about rotifers is false?

Which statement about the nematode (roundworm) group is false?

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

Nematode diversity is important to ecosystems because

Arthropods have a rigid exoskeleton that prevents wormlike movement; instead, they move using _______ that are manipulated by muscles.

Refer to the figure showing an arthropod exoskeleton. Which structure is/are common to arthropods and annelids?

In many endoparasitic flatworms, most of the body is

_______ insects, a subgroup of the _______ insects, undergo _______ metamorphosis.

Which of the following are not members of the annelid group?

Arthropods were able to transition from aquatic to terrestrial environments due to a _______.

Some cephalopods have a modified excurrent siphon and mantle to allow them to

Refer to the figure showing a nudibranch. Nudibranchs are poisonous.The bright colors of the upper side of the body

A very small animal (about 0.5‒1.5 mm in length) with fleshy, unjointed legs that lives in marine sand is most likely a(n)

In flatworms, the advantage a dorsoventrally flattened body is that it allows them to

Both rotifers and flatworms possess

Studying Life

Small Molecules and the Chemistry of Life

Proteins, Carbohydrates, and Lipids

Nucleic Acids and the Origin of Life

Cells: the Working Units of Life

Cell Membranes

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Pathways That Harvest Chemical Energy

Photosynthesis: Energy From Sunlight

The Cell Cycle and Cell Division

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Dna and Its Role in Heredity

From Dna to Protein: Gene Expression

Gene Mutation and Molecular Medicine

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Plants Without Seeds: From Water to Land

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___ insects, a subgroup of the _ insects, undergo _____ metamorphosis.