Question 1

The diversification of insects about 450 million years ago corresponded with

Accepted Answer

A)  the appearance of the first land plants. 
B)  the extinction of the trilobites. 
C)  the extinction of dinosaurs. 
D)  changes in the CO2 concentration of the atmosphere. 
E)  appearance of a chitinous exoskeleton. 
A)  the appearance of the first land plants. 
B)  the extinction of the trilobites. 
C)  the extinction of dinosaurs. 
D)  changes in the CO2 concentration of the atmosphere. 
E)  appearance of a chitinous exoskeleton.

Question 2

Which statement about leeches is false?

Accepted Answer

A)  The coelom is not divided into compartments. 
B)  They make an incision in a host to ingest blood. 
C)  They have elaborate parapodia. 
D)  Groups of segments at each end of the body are modified into suckers. 
E)  They secrete anticoagulants into wounds. 
A)  The coelom is not divided into compartments. 
B)  They make an incision in a host to ingest blood. 
C)  They have elaborate parapodia. 
D)  Groups of segments at each end of the body are modified into suckers. 
E)  They secrete anticoagulants into wounds.

Question 3

Arthropods are the most numerous animals on Earth.Which trait likely made the smallest contribution to their success?

Accepted Answer

A)  A rigid exoskeleton 
B)  Jointed appendages 
C)  Waterproofing by chitin 
D)  Color of the exoskeleton 
E)  Specialization of different appendages 
A)  A rigid exoskeleton 
B)  Jointed appendages 
C)  Waterproofing by chitin 
D)  Color of the exoskeleton 
E)  Specialization of different appendages

Question 4

In the evolution of insects, _______ allowed the exchange of gases with the air, leading to the exploitation of terrestrial environments.

Accepted Answer

A)  tracheae 
B)  gills 
C)  lophophores 
D)  chelicerae 
E)  dorsal circulatory vessels 
A)  tracheae 
B)  gills 
C)  lophophores 
D)  chelicerae 
E)  dorsal circulatory vessels

Question 5

Which of the following is a distinct morphological feature of thin-cuticled, wormlike ecdysozoans that live in marine sediments?

Accepted Answer

A)  A toothed pharynx found in the digestive tract 
B)  A U-shaped ring of ciliated, hollow tentacles around the mouth 
C)  Paired appendages 
D)  A trochophore larva 
E)  Hermaphroditic reproductive system 
A)  A toothed pharynx found in the digestive tract 
B)  A U-shaped ring of ciliated, hollow tentacles around the mouth 
C)  Paired appendages 
D)  A trochophore larva 
E)  Hermaphroditic reproductive system

Question 6

Which features distinguish springtails from insects?

Accepted Answer

A)  Springtails undergo numerous molts upon hatching. 
B)  Springtails have internal mouthparts. 
C)  Springtails use chelicerae for feeding. 
D)  Springtails are wingless. 
E)  Springtails have motion-sensitive receptors in their antennae. 
A)  Springtails undergo numerous molts upon hatching. 
B)  Springtails have internal mouthparts. 
C)  Springtails use chelicerae for feeding. 
D)  Springtails are wingless. 
E)  Springtails have motion-sensitive receptors in their antennae.

Question 7

A colonial lophotrochozoan captures food particles at the tips of its tentacles and moves them to its base.From there, food may move along strands of tissue to other individuals.This organism is most likely a(n)_______.

Accepted Answer

The answer of A colonial lophotrochozoan captures food particles at...

Question 8

_______ are so numerous that they are thought to be the most abundant of all marine arthropods.

Accepted Answer

A)  Crustaceans 
B)  Millipedes 
C)  Nematodes 
D)  Barnacles 
E)  Insects 
A)  Crustaceans 
B)  Millipedes 
C)  Nematodes 
D)  Barnacles 
E)  Insects

Question 9

Which statement about nematodes is false?

Accepted Answer

A)  Parasitic nematodes infect many animal species, including humans. 
B)  Parasitic nematodes infect many crop plants. 
C)  Parasitic nematodes undergo direct development without a larval stage. 
D)  Free-living nematodes are abundant. 
E)  Nematodes range in size from microscopic to nine meters in length. 
A)  Parasitic nematodes infect many animal species, including humans. 
B)  Parasitic nematodes infect many crop plants. 
C)  Parasitic nematodes undergo direct development without a larval stage. 
D)  Free-living nematodes are abundant. 
E)  Nematodes range in size from microscopic to nine meters in length.

Question 10

Wings evolved _______ in protostomes, allowing _______ to exploit new lifestyles.

Accepted Answer

A)  once; arthropods 
B)  twice; mollusks 
C)  once; mollusks 
D)  twice; arthropods 
E)  once; annelids 
A)  once; arthropods 
B)  twice; mollusks 
C)  once; mollusks 
D)  twice; arthropods 
E)  once; annelids

Question 11

Which of the following is not a characteristic of most insect species?

Accepted Answer

A)  The ability to fly 
B)  Three basic body regions 
C)  A complex respiratory system, including lungs 
D)  Paired antennae 
E)  A digestive system 
A)  The ability to fly 
B)  Three basic body regions 
C)  A complex respiratory system, including lungs 
D)  Paired antennae 
E)  A digestive system

Question 12

The term "rotifer," shares a root with the word "rotate," and refers to

Accepted Answer

A)  the whirring motion of the cilia of the rotifer feeding apparatus. 
B)  the way rotifers spin in place on an attachment to the substrate. 
C)  the rotating motion of rotifers as they locomote through water. 
D)  the radial symmetry of rotifers. 
E)  the motion of food through the rotifer digestive tract. 
A)  the whirring motion of the cilia of the rotifer feeding apparatus. 
B)  the way rotifers spin in place on an attachment to the substrate. 
C)  the rotating motion of rotifers as they locomote through water. 
D)  the radial symmetry of rotifers. 
E)  the motion of food through the rotifer digestive tract.

Question 13

Squids and octopuses are known as _______ mollusks because of their large heads with associated long, multiple feet.

Accepted Answer

The answer of Squids and octopuses are known as _______...

Question 14

Scientists have not found a fossilized body of the species that is the common ancestor of all bilaterally symmetrical animals.What is the likelihood that they will do so? How have scientists been able to learn about this common ancestor?

Accepted Answer

The vast majority of species that have l

Question 15

Which of the following is not one of the traits that unites the protostomes?

Accepted Answer

A)  Dorsal nervous system 
B)  Anterior brain 
C)  Bilaterally symmetrical body plan 
D)  Development of a mouth from a blastopore (in many species) 
E)  All of the above are traits that unite the protostomes. 
A)  Dorsal nervous system 
B)  Anterior brain 
C)  Bilaterally symmetrical body plan 
D)  Development of a mouth from a blastopore (in many species) 
E)  All of the above are traits that unite the protostomes.

Question 16

Which characteristic of bryozoans would indicate that they feed by sweeping a feeding organ through the water?

Accepted Answer

A)  Most species are marine. 
B)  Some species occur in fresh water. 
C)  They build structures composed of calcium carbonate. 
D)  Their eggs are fertilized internally. 
E)  They have lophophores. 
A)  Most species are marine. 
B)  Some species occur in fresh water. 
C)  They build structures composed of calcium carbonate. 
D)  Their eggs are fertilized internally. 
E)  They have lophophores.

Question 17

Ecdysozoans

Accepted Answer

A)  are a polyphyletic group. 
B)  all have a thick, hard exoskeleton. 
C)  all have an exoskeleton that is composed of protein and chitin. 
D)  all have a cuticle. 
E)  all have jointed appendages. 
A)  are a polyphyletic group. 
B)  all have a thick, hard exoskeleton. 
C)  all have an exoskeleton that is composed of protein and chitin. 
D)  all have a cuticle. 
E)  all have jointed appendages.

Question 18

Which feature of rotifers is also present in the flatworms, their sister group?

Accepted Answer

A)  Complete gut 
B)  Pseudocoel 
C)  Gonads 
D)  Hemocoel 
E)  Digestive gland 
A)  Complete gut 
B)  Pseudocoel 
C)  Gonads 
D)  Hemocoel 
E)  Digestive gland

Question 19

Which statement about bryozoans is false?

Accepted Answer

A)  Most species are sessile. 
B)  Most species are colonial. 
C)  Colonial species create and inhabit structures from secreted material. 
D)  Bryozoan colonial structures create small reefs. 
E)  The anus is located inside the ring of tentacles of the lophophore. 
A)  Most species are sessile. 
B)  Most species are colonial. 
C)  Colonial species create and inhabit structures from secreted material. 
D)  Bryozoan colonial structures create small reefs. 
E)  The anus is located inside the ring of tentacles of the lophophore.

Question 20

Although ________ resemble mollusks superficially, they possess a lophophore and are typically attached to the substrate by a short, flexible stalk.

Accepted Answer

The answer of Although ________ resemble mollusks superficially, they possess...

Exam 31: Protostome Animals

The diversification of insects about 450 million years ago corresponded with

Which statement about leeches is false?

Arthropods are the most numerous animals on Earth.Which trait likely made the smallest contribution to their success?

In the evolution of insects, _______ allowed the exchange of gases with the air, leading to the exploitation of terrestrial environments.

Which of the following is a distinct morphological feature of thin-cuticled, wormlike ecdysozoans that live in marine sediments?

Which features distinguish springtails from insects?

A colonial lophotrochozoan captures food particles at the tips of its tentacles and moves them to its base.From there, food may move along strands of tissue to other individuals.This organism is most likely a(n)_______.

_______ are so numerous that they are thought to be the most abundant of all marine arthropods.

Which statement about nematodes is false?

Wings evolved _______ in protostomes, allowing _______ to exploit new lifestyles.

Which of the following is not a characteristic of most insect species?

The term "rotifer," shares a root with the word "rotate," and refers to

Squids and octopuses are known as _______ mollusks because of their large heads with associated long, multiple feet.

Scientists have not found a fossilized body of the species that is the common ancestor of all bilaterally symmetrical animals.What is the likelihood that they will do so? How have scientists been able to learn about this common ancestor?

Which of the following is not one of the traits that unites the protostomes?

Which characteristic of bryozoans would indicate that they feed by sweeping a feeding organ through the water?

Ecdysozoans

Which feature of rotifers is also present in the flatworms, their sister group?

Which statement about bryozoans is false?

Although ________ resemble mollusks superficially, they possess a lophophore and are typically attached to the substrate by a short, flexible stalk.

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

Cell Communication and Multicellularity

Energy, Enzymes, and Metabolism

Pathways That Harvest Chemical Energy

Photosynthesis: Energy From Sunlight

The Cell Cycle and Cell Division

Inheritance, Genes, and Chromosomes

Dna and Its Role in Heredity

From Dna to Protein: Gene Expression

Gene Mutation and Molecular Medicine

Regulation of Gene Expression

Genomes

Recombinant Dna and Biotechnology

Mechanisms of Evolution

Reconstructing and Using Phylogenies

Speciation

Evolution of Genes and Genomes

The History of Life on Earth

Bacteria, Archaea, and Viruses

The Origin and Diversification of Eukaryotes

Plants Without Seeds: From Water to Land

The Evolution of Seed Plants

The Evolution and Diversity of Fungi

Animal Origins and the Evolution of Body Plans

Deuterostome Animals

The Plant Body

Transport in Plants

Plant Nutrition

Regulation of Plant Growth

Reproduction in Flowering Plants

Plant Responses to Environmental Challenges

Physiology, Homeostasis, and Temperature Regulation

Animal Hormones

Immunology: Animal Defense Systems

Animal Reproduction

Animal Development

Neurons, Glia, and Nervous Systems

Sensory Systems

The Mammalian Nervous System: Structure and Higher Functions

Musculoskeletal Systems

Gas Exchange

Circulatory Systems

Nutrition, Digestion, and Absorption

Salt and Water Balance and Nitrogen Excretion

Animal Behavior

The Physical Environment and Biogeography of Life

Populations

Species Interactions

Communities

Ecosystems

A Changing Biosphere

Filters

Wings evolved _ in protostomes, allowing _ to exploit new lifestyles.