Question 1

Most parasite species have a

Accepted Answer

A)  simple life cycle and a single larval stage. 
B)  simple life cycle and a single host. 
C)  complex life cycle, multiple larval stages, and a single host. 
D)  complex life cycle, a single larval stage, and multiple hosts. 
E)  complex life cycle, multiple larval stages, and multiple hosts. 
A)  simple life cycle and a single larval stage. 
B)  simple life cycle and a single host. 
C)  complex life cycle, multiple larval stages, and a single host. 
D)  complex life cycle, a single larval stage, and multiple hosts. 
E)  complex life cycle, multiple larval stages, and multiple hosts.

Question 2

_______ are organisms that eat both plants and animals.

Accepted Answer

The answer of _______ are organisms that eat both plants...

Question 3

The embryos of _______ animals have two cell layers: an outer _______ and an inner _______.

Accepted Answer

diploblast

Question 4

What are some advantages to segmentation?

Accepted Answer

Segmentation provides several

Question 5

Sponges

Accepted Answer

A)  were once thought to be plants. 
B)  do not share a common ancestor with animals. 
C)  are symmetrical. 
D)  have cell layers and true organs. 
E)  are eumetazoans. 
A)  were once thought to be plants. 
B)  do not share a common ancestor with animals. 
C)  are symmetrical. 
D)  have cell layers and true organs. 
E)  are eumetazoans.

Question 6

Which of the following statements about coelomate animals is false?

Accepted Answer

A)  Coelomates are triploblastic. 
B)  There is an inner layer of mesoderm surrounding the internal organs in coelomates. 
C)  The body cavity of coelomates is filled with mesenchyme. 
D)  The body cavity of coelomates can act as a hydrostatic skeleton. 
E)  An earthworm is an example of a coelomate. 
A)  Coelomates are triploblastic. 
B)  There is an inner layer of mesoderm surrounding the internal organs in coelomates. 
C)  The body cavity of coelomates is filled with mesenchyme. 
D)  The body cavity of coelomates can act as a hydrostatic skeleton. 
E)  An earthworm is an example of a coelomate.

Question 7

Use the following to answer questions :
Refer to the diagram below, showing the life cycle of a cnidarian.  
-Of the three main clades of cnidarians, which class is shown?

Accepted Answer

The answer of Use the following to answer questions :
Refer...

Question 8

Animals most likely arose from colonial flagellated protists as a result of division of labor among their aggregated cells. Among the extant animals, the _______ bear the strongest similarity to the most recent common ancestor of animals.

Accepted Answer

The answer of Animals most likely arose from colonial flagellated...

Question 9

In what way does the mesogleal layer found in both ctenophores and cnidarians help these organisms survive, even when prey is scarce?

Accepted Answer

A)  Prey adheres to the sticky surface of the mesoglea. 
B)  The mesoglea is biologically inert. 
C)  The mesoglea allows the animal to capture large prey items. 
D)  Mesogleal molecules provide nutrients to the host animal. 
E)  The mesoglea houses photosynthetic bacteria that supplement the nutrition obtained from prey. 
A)  Prey adheres to the sticky surface of the mesoglea. 
B)  The mesoglea is biologically inert. 
C)  The mesoglea allows the animal to capture large prey items. 
D)  Mesogleal molecules provide nutrients to the host animal. 
E)  The mesoglea houses photosynthetic bacteria that supplement the nutrition obtained from prey.

Question 10

Cephalization is most commonly associated with

Accepted Answer

A)  spherical symmetry. 
B)  radial symmetry. 
C)  sessile animals. 
D)  bilateral symmetry. 
E)  lophophorate animals. 
A)  spherical symmetry. 
B)  radial symmetry. 
C)  sessile animals. 
D)  bilateral symmetry. 
E)  lophophorate animals.

Question 11

Among the _______, the mouth arises from the blastopore, an embryonic feature that is a synapomorphy of the group.

Accepted Answer

The answer of Among the _______, the mouth arises from...

Question 12

The _______ are marine cnidarians with a thick, firm mesoglea within the medusa.

Accepted Answer

The answer of The _______ are marine cnidarians with a...

Question 13

Which sponge cell type is specialized for creating the currents that draw food particles into the sponge?

Accepted Answer

A)  Spicule 
B)  Pore cell 
C)  Osculum 
D)  Choanocyte 
E)  Nematocyst 
A)  Spicule 
B)  Pore cell 
C)  Osculum 
D)  Choanocyte 
E)  Nematocyst

Question 14

The organisms that make up the sister group of all bilaterally symmetrical animals (protostomes and deuterostomes) are the _______ and _______.

Accepted Answer

ctenophore

Question 15

Which of the following does not contribute to evidence that animals share a common ancestor?

Accepted Answer

A)  Animals share similarities in organization and function of gene sequences such as Hox genes. 
B)  Animals cells have unique types of junctions between them. 
C)  All animals are heterotrophs. 
D)  All animals are eukaryotes. 
E)  All animals have a common set of extracellular matrix proteins. 
A)  Animals share similarities in organization and function of gene sequences such as Hox genes. 
B)  Animals cells have unique types of junctions between them. 
C)  All animals are heterotrophs. 
D)  All animals are eukaryotes. 
E)  All animals have a common set of extracellular matrix proteins.

Question 16

The simplest type of symmetry, in which body parts radiate outward from a central point, is called _______ symmetry. It is widespread among the protists.

Accepted Answer

The answer of The simplest type of symmetry, in which...

Question 17

A fluid-filled body cavity can function as a hydrostatic skeleton because

Accepted Answer

A)  fluids are moderately compressible. 
B)  fluids are highly compressible. 
C)  fluids are incompressible at physiological pressures. 
D)  fluids have the same density as body tissues. 
E)  fluids can be moved by ciliary action. 
A)  fluids are moderately compressible. 
B)  fluids are highly compressible. 
C)  fluids are incompressible at physiological pressures. 
D)  fluids have the same density as body tissues. 
E)  fluids can be moved by ciliary action.

Question 18

In scyphozoans (jellyfish),

Accepted Answer

A)  the dominant form is the polyp. 
B)  polyps are motile. 
C)  prey is captured by injecting a toxin. 
D)  eggs are fertilized internally. 
E)  the gamete-producing stage is hermaphroditic. 
A)  the dominant form is the polyp. 
B)  polyps are motile. 
C)  prey is captured by injecting a toxin. 
D)  eggs are fertilized internally. 
E)  the gamete-producing stage is hermaphroditic.

Question 19

Which of the following traits is not shared by sea anemones and jellyfishes?

Accepted Answer

A)  A medusa as the dominant stage in the life cycle 
B)  Possession of a gastrovascular cavity 
C)  Sexual reproduction 
D)  Nematocysts on the tentacles 
E)  A primarily carnivorous diet 
A)  A medusa as the dominant stage in the life cycle 
B)  Possession of a gastrovascular cavity 
C)  Sexual reproduction 
D)  Nematocysts on the tentacles 
E)  A primarily carnivorous diet

Question 20

Which of the following statements about the body cavity of animals is true?

Accepted Answer

A)  The body cavity of coelomates develops from the embryonic ectoderm. 
B)  The body cavity of acoelomates is filled with liquid. 
C)  The pseudocoel of the pseudocoelomates has a peritoneum. 
D)  The acoelomates do not have an enclosed body cavity. 
E)  The coelomates have a body cavity surrounded by peritoneum. 
A)  The body cavity of coelomates develops from the embryonic ectoderm. 
B)  The body cavity of acoelomates is filled with liquid. 
C)  The pseudocoel of the pseudocoelomates has a peritoneum. 
D)  The acoelomates do not have an enclosed body cavity. 
E)  The coelomates have a body cavity surrounded by peritoneum.

Exam 31: Animal Origins and the Evolution of Body Plans

Most parasite species have a

_______ are organisms that eat both plants and animals.

The embryos of _______ animals have two cell layers: an outer _______ and an inner _______.

What are some advantages to segmentation?

Sponges

Which of the following statements about coelomate animals is false?

Use the following to answer questions : Refer to the diagram below, showing the life cycle of a cnidarian. -Of the three main clades of cnidarians, which class is shown?

Animals most likely arose from colonial flagellated protists as a result of division of labor among their aggregated cells. Among the extant animals, the _______ bear the strongest similarity to the most recent common ancestor of animals.

In what way does the mesogleal layer found in both ctenophores and cnidarians help these organisms survive, even when prey is scarce?

Cephalization is most commonly associated with

Among the _______, the mouth arises from the blastopore, an embryonic feature that is a synapomorphy of the group.

The _______ are marine cnidarians with a thick, firm mesoglea within the medusa.

Which sponge cell type is specialized for creating the currents that draw food particles into the sponge?

The organisms that make up the sister group of all bilaterally symmetrical animals (protostomes and deuterostomes) are the _______ and _______.

Which of the following does not contribute to evidence that animals share a common ancestor?

The simplest type of symmetry, in which body parts radiate outward from a central point, is called _______ symmetry. It is widespread among the protists.

A fluid-filled body cavity can function as a hydrostatic skeleton because

In scyphozoans (jellyfish),

Which of the following traits is not shared by sea anemones and jellyfishes?

Which of the following statements about the body cavity of animals 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 Signaling and Communication

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

Recombinent Dna and Biotechnology

Differential Gene Expression in Development

Development and Evolutionary Change

Evidence and Mechanisms of Evolution

Reconstructing and Using Phylogenies

Species and Their Formation

Evolution of Genes and Genomes

The History of Life on Earth

Bacteria and Archaea: the Prokaryotic Domains

The Origin and Diversification of Eukaryotes

Plants Without Seeds: From Water to Land

The Evolution of Seed Plants

Fungi: Recyclers, Pathogens, Parasites, and Plant Partners

Protostome Animals

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 and Nervous Systems

Sensory Systems

The Mammalian Nervous System: Structure and Higher Function

Musculoskeletal Systems

Gas Exchange in Animals

Circulatory Systems

Nutrition, Digestion, and Absorption

Salt and Water Balance and Nitrogen

Animal Behavior

Ecology and the Distribution of Life

Population Ecology

Species Interaction and Coevolution

Community Ecology

Ecosystems and Global Ecology

Conservation Biology

Filters

The embryos of ___ animals have two cell layers: an outer _ and an inner _____.

The organisms that make up the sister group of all bilaterally symmetrical animals (protostomes and deuterostomes) are the _ and _.