Question 1

Refer to the figure showing molting in a fossilized arthropod and in an extant arthropod.   Which of the following is false?

Accepted Answer

A)  Molting shown in the 500-million-year-old fossil arthropod supports the hypothesis that molting may have evolved only once. 
B)  The structure being shed is a cuticle. 
C)  The structure being shed is soft and easily pierced. 
D)  The new cuticle must expand and harden. 
E)  The process of molting is necessary for growth. 
A)  Molting shown in the 500-million-year-old fossil arthropod supports the hypothesis that molting may have evolved only once. 
B)  The structure being shed is a cuticle. 
C)  The structure being shed is soft and easily pierced. 
D)  The new cuticle must expand and harden. 
E)  The process of molting is necessary for growth.

Question 2

The stage of the life cycle of Trichinella spiralis that has the greatest impact on humans is the _______.

Accepted Answer

The answer of The stage of the life cycle of...

Question 3

Which of the following is not found in cephalopods?

Accepted Answer

A)  A head with complex sense organs 
B)  A chambered shell in at least one genus 
C)  A branched foot that bears tentacles and a siphon 
D)  A modified mantle that functions as a lung 
E)  Use of tentacles to capture and subdue prey 
A)  A head with complex sense organs 
B)  A chambered shell in at least one genus 
C)  A branched foot that bears tentacles and a siphon 
D)  A modified mantle that functions as a lung 
E)  Use of tentacles to capture and subdue prey

Question 4

Which of the following is not associated with the rotifers?

Accepted Answer

A)  A pseudocoelom 
B)  A complete gut 
C)  Conspicuous feeding organs 
D)  Radial symmetry 
E)  Movement by beating cilia 
A)  A pseudocoelom 
B)  A complete gut 
C)  Conspicuous feeding organs 
D)  Radial symmetry 
E)  Movement by beating cilia

Question 5

An insect that exhibits gradual changes between its instars is said to undergo

Accepted Answer

A)  incomplete metamorphosis. 
B)  fertilization. 
C)  dispersion. 
D)  ecdysis. 
E)  complete metamorphosis. 
A)  incomplete metamorphosis. 
B)  fertilization. 
C)  dispersion. 
D)  ecdysis. 
E)  complete metamorphosis.

Question 6

A wormlike body form enables animals to

Accepted Answer

A)  escape predators. 
B)  exchange gases efficiently. 
C)  blend into their environments. 
D)  burrow efficiently through marine sediment or soil. 
E)  reproduce asexually. 
A)  escape predators. 
B)  exchange gases efficiently. 
C)  blend into their environments. 
D)  burrow efficiently through marine sediment or soil. 
E)  reproduce asexually.

Question 7

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

Question 8

For terrestrial arthropods, the advantage of a chitinous exoskeleton is that it

Accepted Answer

A)  prevents the animal from dehydrating. 
B)  increases surface area for gas exchange. 
C)  increases the speed of movement. 
D)  provides a stored food supply. 
E)  increases the flexibility of movement. 
A)  prevents the animal from dehydrating. 
B)  increases surface area for gas exchange. 
C)  increases the speed of movement. 
D)  provides a stored food supply. 
E)  increases the flexibility of movement.

Question 9

The most diverse group of insects (i.e., the group with the greatest number of species) consists of the

Accepted Answer

A)  grasshoppers and crickets. 
B)  ants, bees, and wasps. 
C)  lice. 
D)  beetles. 
E)  thrips. 
A)  grasshoppers and crickets. 
B)  ants, bees, and wasps. 
C)  lice. 
D)  beetles. 
E)  thrips.

Question 10

Which structures are specializations of the molluscan foot?

Accepted Answer

A)  Siphon, shell, and radula 
B)  Arms and burrowing foot 
C)  Tentacles and reproductive structures 
D)  Arms, tentacles, and mantle cavity 
E)  Siphon and shell 
A)  Siphon, shell, and radula 
B)  Arms and burrowing foot 
C)  Tentacles and reproductive structures 
D)  Arms, tentacles, and mantle cavity 
E)  Siphon and shell

Question 11

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)  movement of vertebrates onto land. 
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)  movement of vertebrates onto land.

Question 12

Based on their body _______, flatworms and rotifers were not thought to be closely related.However, _______ showed that they are a _______ group.

Accepted Answer

A)  plans; the fossil record; monophyletic 
B)  cavities; gene sequencing; monophyletic 
C)  cavities; the fossil record; polyphyletic 
D)  plans; gene sequencing; monophyletic 
E)  cavities; gene sequencing; polyphyletic 
A)  plans; the fossil record; monophyletic 
B)  cavities; gene sequencing; monophyletic 
C)  cavities; the fossil record; polyphyletic 
D)  plans; gene sequencing; monophyletic 
E)  cavities; gene sequencing; polyphyletic

Question 13

Refer to the figure.   Gas exchange in this animal occurs through

Accepted Answer

A)  spiracles. 
B)  a thin, permeable body wall. 
C)  gills. 
D)  lungs. 
E)  a lophophore. 
A)  spiracles. 
B)  a thin, permeable body wall. 
C)  gills. 
D)  lungs. 
E)  a lophophore.

Question 14

Which statement about 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 15

Which respiratory structure distinguishes insects from other ecdysozoans?

Accepted Answer

A)  Modified mantle 
B)  Gills 
C)  Gas exchange across the cuticle 
D)  Tracheae 
E)  Modified legs 
A)  Modified mantle 
B)  Gills 
C)  Gas exchange across the cuticle 
D)  Tracheae 
E)  Modified legs

Question 16

Nematodes are important in global ecosystems because

Accepted Answer

A)  many nematodes are microscopic and contribute to substrate composition. 
B)  parasitic nematodes have multiple stages, affecting multiple species. 
C)  nematode numbers contribute a huge proportion to overall biomass. 
D)  scavenging nematodes contribute to nutrient cycling. 
E)  nematodes provide a nutrient base for other animals. 
A)  many nematodes are microscopic and contribute to substrate composition. 
B)  parasitic nematodes have multiple stages, affecting multiple species. 
C)  nematode numbers contribute a huge proportion to overall biomass. 
D)  scavenging nematodes contribute to nutrient cycling. 
E)  nematodes provide a nutrient base for other animals.

Question 17

Which of the following are not lophotrochozoans?

Accepted Answer

A)  Nematodes 
B)  Mollusks 
C)  Bryozoans 
D)  Flatworms 
E)  Rotifers 
A)  Nematodes 
B)  Mollusks 
C)  Bryozoans 
D)  Flatworms 
E)  Rotifers

Question 18

Which group of organisms supplies the best evidence that elaborate parapodia are most suitable for respiration in a marine environment?

Accepted Answer

A)  All annelids 
B)  Oligochaetes 
C)  Leeches 
D)  Polychaetes 
E)  Nematodes 
A)  All annelids 
B)  Oligochaetes 
C)  Leeches 
D)  Polychaetes 
E)  Nematodes

Question 19

Many flatworm species are parasitic.Which of the following is an adaptation of flatworms that is associated with a parasitic lifestyle?

Accepted Answer

A)  A highly developed digestive system 
B)  A highly branched gastrovascular cavity 
C)  An organ system for oxygen transport 
D)  Absorption of nutrients through the body surface 
E)  Multiple pairs of appendages 
A)  A highly developed digestive system 
B)  A highly branched gastrovascular cavity 
C)  An organ system for oxygen transport 
D)  Absorption of nutrients through the body surface 
E)  Multiple pairs of appendages

Question 20

Which statement(s) about chitons is true?

Accepted Answer

A)  Their bodies are protected by variable numbers of overlapping calcareous plates. 
B)  They scrape algae, bryozoans, and other organisms from rocks with a radula. 
C)  They are gastropods. 
D)  They feed exclusively on other mollusks. 
E)  They move by means of an excurrent siphon. 
A)  Their bodies are protected by variable numbers of overlapping calcareous plates. 
B)  They scrape algae, bryozoans, and other organisms from rocks with a radula. 
C)  They are gastropods. 
D)  They feed exclusively on other mollusks. 
E)  They move by means of an excurrent siphon.

Exam 31: Protostome Animals

Refer to the figure showing molting in a fossilized arthropod and in an extant arthropod. Which of the following is false?

The stage of the life cycle of Trichinella spiralis that has the greatest impact on humans is the _______.

Which of the following is not found in cephalopods?

Which of the following is not associated with the rotifers?

An insect that exhibits gradual changes between its instars is said to undergo

A wormlike body form enables animals to

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

For terrestrial arthropods, the advantage of a chitinous exoskeleton is that it

The most diverse group of insects (i.e., the group with the greatest number of species) consists of the

Which structures are specializations of the molluscan foot?

The diversification of insects about 450 million years ago corresponded with

Based on their body _______, flatworms and rotifers were not thought to be closely related.However, _______ showed that they are a _______ group.

Refer to the figure. Gas exchange in this animal occurs through

Which statement about flatworms is false?

Which respiratory structure distinguishes insects from other ecdysozoans?

Nematodes are important in global ecosystems because

Which of the following are not lophotrochozoans?

Which group of organisms supplies the best evidence that elaborate parapodia are most suitable for respiration in a marine environment?

Many flatworm species are parasitic.Which of the following is an adaptation of flatworms that is associated with a parasitic lifestyle?

Which statement(s) about chitons is true?

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

Based on their body ___, flatworms and rotifers were not thought to be closely related.However, _ showed that they are a _____ group.