Question 1

What would the presence of a lophophore in a newly discovered species suggest about that organism?

Accepted Answer

A)  it has an exoskeleton 
B)  it grows by shedding its external covering 
C)  it is motile 
D)  it feeds by trapping food particles suspended in the water 
A)  it has an exoskeleton 
B)  it grows by shedding its external covering 
C)  it is motile 
D)  it feeds by trapping food particles suspended in the water

Question 2

You find a multi-legged animal in your garden and want to determine if it is a centipede or a millipede. Which of the following characteristics would allow you to make this distinction?

Accepted Answer

A)  presence of body segments 
B)  poisonous claws 
C)  egg-laying 
D)  molting 
A)  presence of body segments 
B)  poisonous claws 
C)  egg-laying 
D)  molting

Question 3

Which of the following structures in insects functions in gas exchange?

Accepted Answer

A)  compound eyes 
B)  spiracles 
C)  antennae 
D)  chelicerae 
A)  compound eyes 
B)  spiracles 
C)  antennae 
D)  chelicerae

Question 4

Which of the following statements about bryozoans (ectoprocts) is correct?

Accepted Answer

A)  Bryozoans are colonial, build reefs, and are related to corals. 
B)  Bryozoans are colonial and live amongst mosses. 
C)  Adult bryozoans are sessile, but their larvae make up much of marine plankton. 
D)  Bryozoans build reefs and have lophophores that extend through a hard exoskeleton. 
A)  Bryozoans are colonial, build reefs, and are related to corals. 
B)  Bryozoans are colonial and live amongst mosses. 
C)  Adult bryozoans are sessile, but their larvae make up much of marine plankton. 
D)  Bryozoans build reefs and have lophophores that extend through a hard exoskeleton.

Question 5

The heartworms that can accumulate within the hearts of dogs and other mammals have a hemocoel, an alimentary canal, and an outer covering that is occasionally shed. To which phylum does the heartworm belong?

Accepted Answer

A)  Platyhelminthes 
B)  Arthropoda 
C)  Nematoda 
D)  Annelida 
A)  Platyhelminthes 
B)  Arthropoda 
C)  Nematoda 
D)  Annelida

Question 6

What would be the most effective method of reducing the incidence of blood flukes in a human population?

Accepted Answer

A)  reduce the mosquito population 
B)  reduce the population of the intermediate snail host 
C)  avoid contact with rodent droppings 
D)  carefully wash all raw fruits and vegetables 
A)  reduce the mosquito population 
B)  reduce the population of the intermediate snail host 
C)  avoid contact with rodent droppings 
D)  carefully wash all raw fruits and vegetables

Question 7

As you are walking along a beach, you find an animal and believe that it belongs to the class Asteroidea. Which of the following characteristics would support your hypothesis that the animal is a sea star and not another type of echinoderm?

Accepted Answer

A)  It is radially symmetric. 
B)  It feeds on other animals. 
C)  It has a hydrostatic skeleton, formed from its water vascular system. 
D)  it has five or more appendages. 
A)  It is radially symmetric. 
B)  It feeds on other animals. 
C)  It has a hydrostatic skeleton, formed from its water vascular system. 
D)  it has five or more appendages.

Question 8

You find what you believe is a new species of animal. Which of the following characteristics would enable you to argue that it is more closely related to a nematode than it is to an annelid?

Accepted Answer

A)  It is a suspension feeder. 
B)  It has a hemocoel. 
C)  It is shaped like a worm. 
D)  It has a mouth and an anus. 
A)  It is a suspension feeder. 
B)  It has a hemocoel. 
C)  It is shaped like a worm. 
D)  It has a mouth and an anus.

Question 9

Which of the following groups of organisms has flagella associated with its method of feeding?

Accepted Answer

A)  annelids 
B)  coral animals 
C)  tapeworms 
D)  sponges 
A)  annelids 
B)  coral animals 
C)  tapeworms 
D)  sponges

Question 10

Which of the following statements is correct with respect to the evolutionary relationship between chordates and invertebrates?

Accepted Answer

A)  Chordates are most closely related to arthropods. 
B)  Chordates evolved from echinoderms. 
C)  Chordates are more closely related to echinoderms than to arthropods. 
D)  Chordates are most closely related to the tunicate-type of echinoderms. 
A)  Chordates are most closely related to arthropods. 
B)  Chordates evolved from echinoderms. 
C)  Chordates are more closely related to echinoderms than to arthropods. 
D)  Chordates are most closely related to the tunicate-type of echinoderms.

Question 11

The sharp, inch-long thorns of the crown-of-thorns sea star are its spines. These spines, unlike those of most other sea stars, contain a potent toxin. If it were discovered that crown-of-thorns sea stars do not make this toxin themselves, then what is the most likely alternative source for the toxin?

Accepted Answer

A)  it is derived from the nematocysts of its prey 
B)  it is absorbed from the surrounding seawater 
C)  it is an endotoxin of cellulose-digesting bacteria that inhabit the sea star's digestive glands 
D)  it is injected into individual thorns by mutualistic corals which live on the aboral surfaces of these sea stars 
A)  it is derived from the nematocysts of its prey 
B)  it is absorbed from the surrounding seawater 
C)  it is an endotoxin of cellulose-digesting bacteria that inhabit the sea star's digestive glands 
D)  it is injected into individual thorns by mutualistic corals which live on the aboral surfaces of these sea stars

Question 12

Why do large animals need specialized organs for gas exchange?

Accepted Answer

A)  they require more oxygen per unit of volume 
B)  surface area increases more rapidly than volume as size increases 
C)  volume increases more rapidly than surface area as size increases 
D)  they collect more energy and therefore have more energy to allocate to specialized tissues 
A)  they require more oxygen per unit of volume 
B)  surface area increases more rapidly than volume as size increases 
C)  volume increases more rapidly than surface area as size increases 
D)  they collect more energy and therefore have more energy to allocate to specialized tissues

Question 13

In these figures, which two main clades branch from the most recent common ancestor of the eumetazoans?

Accepted Answer

A)  Porifera and Cnidaria 
B)  Lophotrochozoa and Ecdysozoa 
C)  Cnidaria and Bilateria 
D)  Deuterostomia and Bilateria 
A)  Porifera and Cnidaria 
B)  Lophotrochozoa and Ecdysozoa 
C)  Cnidaria and Bilateria 
D)  Deuterostomia and Bilateria

Question 14

Which structure do sea slugs use to feed on their prey?

Accepted Answer

A)  nematocysts 
B)  an incurrent siphon 
C)  a radula 
D)  a mantle cavity 
A)  nematocysts 
B)  an incurrent siphon 
C)  a radula 
D)  a mantle cavity

Question 15

Use the following information and figure to answer the question.
Aphids are hemipterans that suck phloem liquid from plants. Ants are often seen collecting the liquid off the posterior end of the aphid and collecting the liquid that is released from the aphid's digestive system. In an effort to understand this interaction, several researchers measure the survival rates of aphid populations when ants were present and when they were excluded. Their results are shown.  
Which of the following conclusions is most consistent with the data?

Accepted Answer

A)  Ants derive nourishment from the aphids. 
B)  Ants protect the aphids from predators. 
C)  Ants parasitize the aphids. 
D)  Ants carry the aphids to a food source. 
A)  Ants derive nourishment from the aphids. 
B)  Ants protect the aphids from predators. 
C)  Ants parasitize the aphids. 
D)  Ants carry the aphids to a food source.

Question 16

The phylum Cycliophora includes tiny organisms that live in large numbers on the outsides of the mouthparts and appendages of lobsters. The feeding stage permanently attaches to the lobster and collects scraps of food from its host's feeding by capturing the scraps in a current created by a ring of cilia.
The feeding stage of cycliophorans is best described as ________.

Accepted Answer

A)  autotrophic and captures food in a manner similar to gastropods 
B)  sessile and captures food in a manner similar to that of animals with lophophores 
C)  sessile and radially symmetric 
D)  autotrophic and sessile 
A)  autotrophic and captures food in a manner similar to gastropods 
B)  sessile and captures food in a manner similar to that of animals with lophophores 
C)  sessile and radially symmetric 
D)  autotrophic and sessile

Question 17

Which of the following characteristics of their exoskeletons is exhibited by both arthropods and molluscs?

Accepted Answer

A)  they completely replace the hydrostatic skeleton 
B)  they are secreted by the mantle 
C)  they help retain moisture in terrestrial habitats 
D)  they are comprised of the polysaccharide chitin 
A)  they completely replace the hydrostatic skeleton 
B)  they are secreted by the mantle 
C)  they help retain moisture in terrestrial habitats 
D)  they are comprised of the polysaccharide chitin

Question 18

Which of the following statements best explains how planarians can survive and thrive without respiratory or circulatory systems?

Accepted Answer

A)  none of their cells are far removed from the gastrovascular cavity or from the external environment 
B)  they lack mesoderm as embryos and, therefore, lack the adult tissues derived from mesoderm 
C)  their flame bulbs can carry out respiratory and circulatory functions 
D)  their body cavity, a pseudocoelom, carries out these functions 
A)  none of their cells are far removed from the gastrovascular cavity or from the external environment 
B)  they lack mesoderm as embryos and, therefore, lack the adult tissues derived from mesoderm 
C)  their flame bulbs can carry out respiratory and circulatory functions 
D)  their body cavity, a pseudocoelom, carries out these functions

Exam 33: Invertebrates

What would the presence of a lophophore in a newly discovered species suggest about that organism?

You find a multi-legged animal in your garden and want to determine if it is a centipede or a millipede. Which of the following characteristics would allow you to make this distinction?

Which of the following structures in insects functions in gas exchange?

Which of the following statements about bryozoans (ectoprocts) is correct?

The heartworms that can accumulate within the hearts of dogs and other mammals have a hemocoel, an alimentary canal, and an outer covering that is occasionally shed. To which phylum does the heartworm belong?

What would be the most effective method of reducing the incidence of blood flukes in a human population?

As you are walking along a beach, you find an animal and believe that it belongs to the class Asteroidea. Which of the following characteristics would support your hypothesis that the animal is a sea star and not another type of echinoderm?

You find what you believe is a new species of animal. Which of the following characteristics would enable you to argue that it is more closely related to a nematode than it is to an annelid?

Which of the following groups of organisms has flagella associated with its method of feeding?

Which of the following statements is correct with respect to the evolutionary relationship between chordates and invertebrates?

Why do large animals need specialized organs for gas exchange?

In these figures, which two main clades branch from the most recent common ancestor of the eumetazoans?

Which structure do sea slugs use to feed on their prey?

Which of the following characteristics of their exoskeletons is exhibited by both arthropods and molluscs?

Which of the following statements best explains how planarians can survive and thrive without respiratory or circulatory systems?

Biology and Its Themes

Atoms and Molecules

The Chemistry of Water

Carbon: the Basis of Molecular Diversity

Biological Macromolecules and Lipids

Energy and Life

Cell Structure and Function

Cell Membranes

Cellular Signaling

Cell Respiration

Photosynthetic Processes

Mitosis

Sexual Life Cycles and Meiosis

Mendelian Genetics

Linkage and Chromosomes

Nucleic Acids and Inheritance

Expression of Genes

Control of Gene Expression

Dna Technology

The Evolution of Genomes

How Evolution Works

Phylogenetic Reconstruction

Microevolution

Species and Speciation

Macroevolution

Introduction to Viruses

Prokaryotes

The Origin and Evolution of Eukaryotes

Nonvascular and Seedless Vascular Plants

Seed Plants

Introduction to Fungi

An Introduction to Animal Diversity

Vertebrates

Plant Structure and Growth

Transport in Vascular Plants

Plant Nutrition

Reproduction of Flowering Plants

Plant Signals and Behavior

The Animal Body

Chemical Signals in Animals

Animal Digestive Systems

Animal Transport Systems

Animal Excretory Systems

Animal Reproductive Systems

Development in Animals

Animal Defenses Against Infection

Electrical Signals in Animals

Neural Regulation in Animals

Sensation and Movement in Animals

An Overview of Ecology

Behavioral Ecology

Populations and Life History Traits

Biodiversity and Communities

Energy Flow and Chemical Cycling in Ecosystems

Conservation and Global Ecology

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