Question 1

The most primitive bilaterally symmetrical and the simplest acoelomatic animals in which organs occur are the _________.

Accepted Answer

The answer of The most primitive bilaterally symmetrical and the...

Question 2

An invertebrate biologist explains to your class that she studies the choanocytes of sponges.You know that choanocytes are

Accepted Answer

A) specialized cells near the osculum of the sponge. 
B) specialized cells that contain spongin and thus contribute to the sponge's rigid structure. 
C) specialized cells that eventually form spicules. 
D) specialized cells that have flagella and function to gather food particles. 
E) specialized cells from which larval sponges develop. 
A) specialized cells near the osculum of the sponge. 
B) specialized cells that contain spongin and thus contribute to the sponge's rigid structure. 
C) specialized cells that eventually form spicules. 
D) specialized cells that have flagella and function to gather food particles. 
E) specialized cells from which larval sponges develop.

Question 3

The most prominent phylum of acoelomates,_____________,includes the free-living flatworms and the parasitic flukes and tapeworms.

Accepted Answer

The answer of The most prominent phylum of acoelomates,_____________,includes the...

Question 4

Flatworms are similar to sponges,cnidarians,and ctenophores in which of the following?

Accepted Answer

A) contain an excretory system lined with a network of fine tubules running through the body 
B) contain an incomplete gut with only one opening 
C) cilia line the hollow centers of bulb-like flame cells 
D) lack circulatory systems for transport of oxygen and food 
E) most are hermaphroditic 
A) contain an excretory system lined with a network of fine tubules running through the body 
B) contain an incomplete gut with only one opening 
C) cilia line the hollow centers of bulb-like flame cells 
D) lack circulatory systems for transport of oxygen and food 
E) most are hermaphroditic

Question 5

Which of the following is not true about beef tapeworms?

Accepted Answer

A) occur as a juvenile in the intermuscular tissue of cattle 
B) found as an adult in the intestines of human beings 
C) able to produce embryos,which may be viable for up to five months 
D) able to reach adult length of up to 10 meters 
E) more than 10% of the cattle are infected in the United States 
A) occur as a juvenile in the intermuscular tissue of cattle 
B) found as an adult in the intestines of human beings 
C) able to produce embryos,which may be viable for up to five months 
D) able to reach adult length of up to 10 meters 
E) more than 10% of the cattle are infected in the United States

Question 6

Schistosomiasis is a serious disorder afflicting humans mainly in tropical regions;it is caused by a

Accepted Answer

A) carp or goldfish. 
B) fluke. 
C) nematode. 
D) snail. 
E) tapeworm. 
A) carp or goldfish. 
B) fluke. 
C) nematode. 
D) snail. 
E) tapeworm.

Question 7

Which one of the following features does not distinguish the eumetazoa from the parazoa?

Accepted Answer

A) some type of symmetry 
B) distinct cell types forming tissues 
C) possession of ectoderm and endoderm 
D) polyp and medusa body forms and organs 
E) a body plan 
A) some type of symmetry 
B) distinct cell types forming tissues 
C) possession of ectoderm and endoderm 
D) polyp and medusa body forms and organs 
E) a body plan

Question 8

Cnidarians characteristically possess specialized cells which contain a __________,a harpoon used to attack prey.

Accepted Answer

The answer of Cnidarians characteristically possess specialized cells which contain...

Question 9

Anthozoan corals are characterized by all of the following except

Accepted Answer

A) some may have hard calcium carbonate exoskeletons. 
B) the coral animals are always found in nutrient-rich waters. 
C) some participate in the formation of shallow-water limestone ridges. 
D) many harbor symbiotic algae. 
E) they are a class of cnidarians. 
A) some may have hard calcium carbonate exoskeletons. 
B) the coral animals are always found in nutrient-rich waters. 
C) some participate in the formation of shallow-water limestone ridges. 
D) many harbor symbiotic algae. 
E) they are a class of cnidarians.

Question 10

Choose the letter of the best match from the following:
-Bilaterally symmetrical acoelomates.

Accepted Answer

A) Cnidaria 
B) Nematoda 
C) Platyhelminthes 
D) Porifera 
E) Ctenophora 
A) Cnidaria 
B) Nematoda 
C) Platyhelminthes 
D) Porifera 
E) Ctenophora

Question 11

Which one of the following features is not found in animals of the phylum Porifera?

Accepted Answer

A) spicules or spongin 
B) food-gathering dependent entirely on cilia 
C) water leaving the sponge at the osculum 
D) adults that are entirely sessile (attached to the bottom) 
E) tissues and organs 
A) spicules or spongin 
B) food-gathering dependent entirely on cilia 
C) water leaving the sponge at the osculum 
D) adults that are entirely sessile (attached to the bottom) 
E) tissues and organs

Question 12

Which of the following nematode parasites lives in the lymphatic system of humans where they may cause obstruction resulting in severe swelling called elephantiasis.

Accepted Answer

A) Ascaris 
B) Trichinella 
C) Necator 
D) Filaria 
E) Enterobius 
A) Ascaris 
B) Trichinella 
C) Necator 
D) Filaria 
E) Enterobius

Question 13

Which one of the following statements comparing the hydrozoans Hydra and Obelia is false?

Accepted Answer

A) Unlike Hydra,Obelia and most hydrozoans are colonial. 
B) Unlike Hydra,Obelia and most hydrozoans are marine. 
C) In Hydra,the medusa stage is more conspicuous than the polyp stage;the reverse is true for Obelia. 
D) The polyps and medusae of both Hydra and Obelia have gastrovascular cavities. 
E) Both Hydra and Obelia have cnidocytes. 
A) Unlike Hydra,Obelia and most hydrozoans are colonial. 
B) Unlike Hydra,Obelia and most hydrozoans are marine. 
C) In Hydra,the medusa stage is more conspicuous than the polyp stage;the reverse is true for Obelia. 
D) The polyps and medusae of both Hydra and Obelia have gastrovascular cavities. 
E) Both Hydra and Obelia have cnidocytes.

Question 14

Which one of the following is not a cell type found in the cnidarians?

Accepted Answer

A) epidermal 
B) gastrodermal 
C) nerve 
D) myoepithial 
E) nematocyst 
A) epidermal 
B) gastrodermal 
C) nerve 
D) myoepithial 
E) nematocyst

Question 15

The long,flat bodies of tapeworms are made up of repeating segments known as

Accepted Answer

A) antheridiA. 
B) gut blocks. 
C) proglottids. 
D) scolex. 
E) miracidia. 
A) antheridiA. 
B) gut blocks. 
C) proglottids. 
D) scolex. 
E) miracidia.

Question 16

Choose the letter of the best match from the following:
-Comb jellies;propel themselves by means of eight comb-like plates of fused cilia.

Accepted Answer

A) Cnidaria 
B) Nematoda 
C) Platyhelminthes 
D) Porifera 
E) Ctenophora 
A) Cnidaria 
B) Nematoda 
C) Platyhelminthes 
D) Porifera 
E) Ctenophora

Question 17

Which of the following statements about the phyla Nematoda and Rotifera is false?

Accepted Answer

A) Nematodes use muscle power for locomotion;rotifers use ciliA. 
B) Nematodes are much more abundant than rotifers. 
C) Both nematodes and rotifers have a digestive system with mouth and anus. 
D) Common possession of a rigid body suggests that the phyla Nematoda and Rotifera share a recent common ancestor. 
E) Both nematodes and rotifers are bilaterally symmetric. 
A) Nematodes use muscle power for locomotion;rotifers use ciliA. 
B) Nematodes are much more abundant than rotifers. 
C) Both nematodes and rotifers have a digestive system with mouth and anus. 
D) Common possession of a rigid body suggests that the phyla Nematoda and Rotifera share a recent common ancestor. 
E) Both nematodes and rotifers are bilaterally symmetric.

Question 18

Two phyla that belong to the Ecdysozoan clade are

Accepted Answer

A) Platyhelminthes and NematodA. 
B) Nematoda and Arthropoda. 
C) Annelida and Mollusca. 
D) Mollusca and Arthropoda. 
E) Platyhelminthes and Arthropoda. 
A) Platyhelminthes and NematodA. 
B) Nematoda and Arthropoda. 
C) Annelida and Mollusca. 
D) Mollusca and Arthropoda. 
E) Platyhelminthes and Arthropoda.

Exam 33: Noncoelomate Invertebrates

The most primitive bilaterally symmetrical and the simplest acoelomatic animals in which organs occur are the _________.

An invertebrate biologist explains to your class that she studies the choanocytes of sponges.You know that choanocytes are

The most prominent phylum of acoelomates,_____________,includes the free-living flatworms and the parasitic flukes and tapeworms.

Flatworms are similar to sponges,cnidarians,and ctenophores in which of the following?

Which of the following is not true about beef tapeworms?

Schistosomiasis is a serious disorder afflicting humans mainly in tropical regions;it is caused by a

Which one of the following features does not distinguish the eumetazoa from the parazoa?

Cnidarians characteristically possess specialized cells which contain a __________,a harpoon used to attack prey.

Anthozoan corals are characterized by all of the following except

Choose the letter of the best match from the following: -Bilaterally symmetrical acoelomates.

Which one of the following features is not found in animals of the phylum Porifera?

Which of the following nematode parasites lives in the lymphatic system of humans where they may cause obstruction resulting in severe swelling called elephantiasis.

Which one of the following statements comparing the hydrozoans Hydra and Obelia is false?

Which one of the following is not a cell type found in the cnidarians?

The long,flat bodies of tapeworms are made up of repeating segments known as

Choose the letter of the best match from the following: -Comb jellies;propel themselves by means of eight comb-like plates of fused cilia.

Which of the following statements about the phyla Nematoda and Rotifera is false?

Two phyla that belong to the Ecdysozoan clade are

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