Question 1

In animals with two or more life stages, which is least associated with dispersal?

Accepted Answer

A)  Discharge of eggs and sperm into the water by sessile marine animals 
B)  Trochophore larva 
C)  Nauplius larva 
D)  Caterpillar 
E)  Adult moth 
A)  Discharge of eggs and sperm into the water by sessile marine animals 
B)  Trochophore larva 
C)  Nauplius larva 
D)  Caterpillar 
E)  Adult moth

Question 2

The flagella of choanocytes

Accepted Answer

A)  create a current to bring food-bearing water across surfaces. 
B)  allow for locomotion of the sponge as a whole. 
C)  allow for locomotion of individual sponge cells. 
D)  produce gametes. 
E)  give support to the body of the sponge. 
A)  create a current to bring food-bearing water across surfaces. 
B)  allow for locomotion of the sponge as a whole. 
C)  allow for locomotion of individual sponge cells. 
D)  produce gametes. 
E)  give support to the body of the sponge.

Question 3

An insect that lives in a habitat where similar food resources are used by all life stages would most likely show a life cycle pattern of _______.

Accepted Answer

The answer of An insect that lives in a habitat...

Question 4

Cnidarians

Accepted Answer

A)  have a complete gut. 
B)  mostly inhabit fresh water. 
C)  use cilia to move through the water. 
D)  produce haploid larvae. 
E)  contain a layer of mesoglea. 
A)  have a complete gut. 
B)  mostly inhabit fresh water. 
C)  use cilia to move through the water. 
D)  produce haploid larvae. 
E)  contain a layer of mesoglea.

Question 5

An animal with sharp teeth and claws, such as a wolf, would most likely be a(n) ________.

Accepted Answer

The answer of An animal with sharp teeth and claws,...

Question 6

The characteristic of sponges that most resembles the hypothetical animal ancestor is their

Accepted Answer

A)  plantlike appearance. 
B)  silicaceous or calcareous spicules for support. 
C)  cell layers that form true organs. 
D)  flagellated choanocytes. 
E)  coloniality. 
A)  plantlike appearance. 
B)  silicaceous or calcareous spicules for support. 
C)  cell layers that form true organs. 
D)  flagellated choanocytes. 
E)  coloniality.

Question 7

Which statement about the symmetry of organisms is false?

Accepted Answer

A)  Radial symmetry is common in ctenophores and cnidarians. 
B)  Radial symmetry is common in segmented animals. 
C)  Spherical symmetry is common in unicellular protists. 
D)  The back of a bilaterally symmetrical organism is the dorsal surface. 
E)  Sensory organs in a bilaterally symmetrical organism are located on the anterior end of the organism. 
A)  Radial symmetry is common in ctenophores and cnidarians. 
B)  Radial symmetry is common in segmented animals. 
C)  Spherical symmetry is common in unicellular protists. 
D)  The back of a bilaterally symmetrical organism is the dorsal surface. 
E)  Sensory organs in a bilaterally symmetrical organism are located on the anterior end of the organism.

Question 8

Which group consists of members that are entirely colonial and sessile?

Accepted Answer

A)  Sea anemones 
B)  Hydrozoans 
C)  Jellyfish 
D)  Corals 
E)  Nematocysts 
A)  Sea anemones 
B)  Hydrozoans 
C)  Jellyfish 
D)  Corals 
E)  Nematocysts

Question 9

There are detritivores among all of the following groups except

Accepted Answer

A)  earthworms and other annelids. 
B)  millipedes. 
C)  insects. 
D)  placozoans. 
E)  crustaceans. 
A)  earthworms and other annelids. 
B)  millipedes. 
C)  insects. 
D)  placozoans. 
E)  crustaceans.

Question 10

The characteristic that best defines placozoans as animals is that they

Accepted Answer

A)  are structurally simple with only a few distinct cell types. 
B)  lack a nervous system but have a nerve net. 
C)  have two surface layers with a layer of contractile fibers in between them. 
D)  are transparent and small in size. 
E)  are marine organisms. 
A)  are structurally simple with only a few distinct cell types. 
B)  lack a nervous system but have a nerve net. 
C)  have two surface layers with a layer of contractile fibers in between them. 
D)  are transparent and small in size. 
E)  are marine organisms.

Question 11

Refer to the table.   In character 22, what is the phylogenetic significance of the character state for the lancelet?

Accepted Answer

A)  The lancelet is the only species with this state. 
B)  It is a common character state with protostomes. 
C)  It is a common character state with deuterostomes. 
D)  It is a common character state with character 24. 
E)  It is a common character state with the outgroup. 
A)  The lancelet is the only species with this state. 
B)  It is a common character state with protostomes. 
C)  It is a common character state with deuterostomes. 
D)  It is a common character state with character 24. 
E)  It is a common character state with the outgroup.

Question 12

What advantage(s) might an omnivorous feeding strategy give an animal?

Accepted Answer

Omnivory gives an animal many different

Question 13

Refer to the table, which compares 27 amino acid positions for ten different species.   Which are shared, derived character states of bilaterians?

Accepted Answer

A)  5 and 12 
B)  7 and 9 
C)  10 and 14 
D)  10 and 22 
E)  15 and 27 
A)  5 and 12 
B)  7 and 9 
C)  10 and 14 
D)  10 and 22 
E)  15 and 27

Question 14

Segmentation of animals is important evolutionarily because it has allowed organisms to

Accepted Answer

A)  grow much larger than would be possible without segmentation. 
B)  alter their body forms in complex ways. 
C)  have both circular and longitudinal muscles. 
D)  reduce surface area-to-volume ratio. 
E)  reproduce asexually. 
A)  grow much larger than would be possible without segmentation. 
B)  alter their body forms in complex ways. 
C)  have both circular and longitudinal muscles. 
D)  reduce surface area-to-volume ratio. 
E)  reproduce asexually.

Question 15

Refer to the figure.   Which pair of terms best describes the mobility and feeding strategy of the comb jelly (a ctenophore) shown?

Accepted Answer

A)  Motile, filter feeder 
B)  Motile, predator 
C)  Sessile, filter feeder 
D)  Sessile, predator 
E)  Sessile, detritivore 
A)  Motile, filter feeder 
B)  Motile, predator 
C)  Sessile, filter feeder 
D)  Sessile, predator 
E)  Sessile, detritivore

Question 16

Which of the following stages is not part of the typical life cycle of a butterfly?

Accepted Answer

A)  Trochophore 
B)  Egg 
C)  Pupa 
D)  Larva 
E)  Adult 
A)  Trochophore 
B)  Egg 
C)  Pupa 
D)  Larva 
E)  Adult

Question 17

Which characteristics are unique to animals?

Accepted Answer

A)  Heterotrophic metabolism and motility 
B)  Muscle tissue and a nervous system 
C)  Multicellularity and motility 
D)  Internal digestion and heterotrophic metabolism 
E)  A nervous system and heterotrophy 
A)  Heterotrophic metabolism and motility 
B)  Muscle tissue and a nervous system 
C)  Multicellularity and motility 
D)  Internal digestion and heterotrophic metabolism 
E)  A nervous system and heterotrophy

Question 18

Motile filter feeders include

Accepted Answer

A)  flamingos. 
B)  corals. 
C)  polychaetes. 
D)  sponges. 
E)  placozoans. 
A)  flamingos. 
B)  corals. 
C)  polychaetes. 
D)  sponges. 
E)  placozoans.

Question 19

Placozoans, ctenophores, and cnidarians are all considered _______, since they have inner and outer embryonic cell layers.

Accepted Answer

The answer of Placozoans, ctenophores, and cnidarians are all considered...

Question 20

Earthworms consume dead organic matter and build up rich soils.The greatest benefit of this feeding strategy to other organisms in the surrounding ecosystem is that

Accepted Answer

A)  organic soils provide habitat to small food items consumed by filter feeders. 
B)  more earthworms are available to carnivores. 
C)  dead materials processed by earthworms are available to parasites. 
D)  plants benefit from nutrient recycling, supplying herbivores with food. 
E)  rich soils are good habitats for other detritivores. 
A)  organic soils provide habitat to small food items consumed by filter feeders. 
B)  more earthworms are available to carnivores. 
C)  dead materials processed by earthworms are available to parasites. 
D)  plants benefit from nutrient recycling, supplying herbivores with food. 
E)  rich soils are good habitats for other detritivores.

Exam 30: Animal Origins and the Evolution of Body Plans

In animals with two or more life stages, which is least associated with dispersal?

The flagella of choanocytes

An insect that lives in a habitat where similar food resources are used by all life stages would most likely show a life cycle pattern of _______.

Cnidarians

An animal with sharp teeth and claws, such as a wolf, would most likely be a(n) ________.

The characteristic of sponges that most resembles the hypothetical animal ancestor is their

Which statement about the symmetry of organisms is false?

Which group consists of members that are entirely colonial and sessile?

There are detritivores among all of the following groups except

The characteristic that best defines placozoans as animals is that they

Refer to the table. In character 22, what is the phylogenetic significance of the character state for the lancelet?

What advantage(s) might an omnivorous feeding strategy give an animal?

Refer to the table, which compares 27 amino acid positions for ten different species. Which are shared, derived character states of bilaterians?

Segmentation of animals is important evolutionarily because it has allowed organisms to

Refer to the figure. Which pair of terms best describes the mobility and feeding strategy of the comb jelly (a ctenophore) shown?

Which of the following stages is not part of the typical life cycle of a butterfly?

Which characteristics are unique to animals?

Motile filter feeders include

Placozoans, ctenophores, and cnidarians are all considered _______, since they have inner and outer embryonic cell layers.

Earthworms consume dead organic matter and build up rich soils.The greatest benefit of this feeding strategy to other organisms in the surrounding ecosystem is that

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Cells: the Working Units of Life

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