Question 1

Which type ofarchaea use a pigment related to the rhodopsin, a pigment found in human eyes, to absorb solar energy and pump chloride ions?

Accepted Answer

A)   methanogens
B)   halophiles
C)   thermoacidophiles
D)   alkaliphiles
E)   psychrophilesF) A) and E)
G) D) and E)

Question 2

Which of the following groups contains the foraminifera?

Accepted Answer

A)   stramenopiles
B)   apicomplexans
C)   dinoflagellates
D)   rhizaria
E)   ameobozoaF) B) and E)
G) A) and D)

Question 3

A bacteria's genetic material can include

Accepted Answer

A)   a circular chromosome.
B)   plasmids.
C)   latent bacteriophage DNA.
D)   a circular chromosome plus plasmids.
E)   a circular chromosome, plasmids, and latent bacteriophage DNA.F) D) and E)
G) A) and B)

Question 4

Which of the following is a characteristic only found in some viruses?

Accepted Answer

A)   an inner core of nucleic acid
B)   a protein capsid
C)   is an obligate intracellular parasite
D)   an envelope
E)   genomes consisting of either DNA or RNAF) All of the above
G) B) and D)

Question 5

African sleeping sickness is caused by a

Accepted Answer

A)   trypanosome.
B)   sporozoan.
C)   prion.
D)   bacterium.
E)   virus.F) All of the above
G) A) and E)

Question 6

A researcher infects a bacterium with a bacteriophage and notices that the infection does not immediately bring about the destruction of the host cell. Instead, the phage's genetic material is copied whenever the host reproduces. Which viral replication cycle is described here?

Accepted Answer

A)   integration cycle
B)   lysogenic cycle
C)   biosynthetic cycle
D)   lytic cycle
E)   emergence cycleF) All of the above
G) A) and D)

Question 7

What evidence supports the idea that archaea are more closely related to eukaryotesthan to bacteria?

Accepted Answer

A)   Archaea and eukaryotes initiate transcription in the same fashion.
B)   Archaea and eukaryotes both have cell walls with peptidoglycan.
C)   Archaea and eukaryotes share some ribosomal proteins and have similar types of tRNA.
D)   Archaea and eukaryotes initiate transcription in the same fashion, share some ribosomal proteins, and have similar types of tRNA.
E)   None of the choices supporta close relationship between eukaryotes and archaea.F) A) and B)
G) B) and C)

Question 8

Which group of organisms are viroids(not viruses) most likely to parasitize?

Accepted Answer

A)   plants
B)   bacteria
C)   fish
D)   fungi
E)   cattleF) A) and D)
G) A) and E)

Question 9

Animal viruses that have an envelope enter cells by

Accepted Answer

A)   injecting their nucleic acid into the cell's cytoplasm.
B)   fusing with the plasma membrane.
C)   endocytosis.
D)   plasmolysis.
E)   either fusing with the plasma membrane or endocytosis.F) B) and D)
G) A) and C)

Question 10

What is the main structural difference between a virus and a viroid?

Accepted Answer

A)   Viroids do not have a capsid covering.
B)   Viruses do not have a capsid covering.
C)   Viroids contain DNA, while viruses do not.
D)   Viruses contain RNA, while viroids do not.
E)   There is no structural difference between the two.F) B) and D)
G) C) and D)

Question 11

Viroids and prions are alike in that both are infectious

Accepted Answer

A)   cell types.
B)   proteins.
C)   molecules.
D)   DNA.
E)   RNA.F) C) and D)
G) None of the above

Question 12

Which of the following statements regarding bacterial endospores is false?

Accepted Answer

A)   Endospores can survive in extremely harsh environments.
B)   Within an endospore is a copy of the bacterial chromosome.
C)   An endospore contains a small amount of cytoplasm material.
D)   Endospores can survive for very long periods of time.
E)   Endospores are reproductive structures.F) B) and D)
G) All of the above

Question 13

How are the algae traditionally categorized?

Accepted Answer

A)   by the mode of motility
B)   by their method of sexual reproduction
C)   by the the color of their pigment
D)   by the type of habitat in which they are found
E)   by their mode of feedingF) C) and D)
G) A) and B)

Question 14

Which means of genetic recombination in bacteria is facilitated by use of a pilus?

Accepted Answer

A)   transformation
B)   transduction
C)   conjugation
D)   both transformation and transduction
E)   translocationF) B) and C)
G) B) and E)

Question 15

One group of protozoans which are nonmotile, produce spores, and have disease-causing species is the

Accepted Answer

A)   foraminiferans.
B)   trypanosomes.
C)   sporozoans.
D)   amoeboids.
E)   radiolarians.F) All of the above
G) A) and E)

Question 16

Which of the following is not a characteristic of Paramecium?

Accepted Answer

A)   a macronucleus produces mRNA and directs metabolic functions
B)   motile with cilia
C)   a micronucleus functions in reproduction
D)   engulfs prey with pseudopods
E)   chemoheterotrophicF) D) and E)
G) A) and E)

Question 17

A virus is specific to a particular type of host cell because

Accepted Answer

A)   only certain hosts enter the environment inhabited by the virus.
B)   not every virus contains metabolic machinery which can replace that of the host cell.
C)   a glycoprotein onthe viralcapsidis a specific match to a receptor on the surface of a compatible host cell.
D)   a host cell must be malfunctioning, or a virus cannot infect it.
E)   the genome of the virus must be similar to that of its potential host.F) C) and D)
G) C) and E)

Question 18

Which of the following is an emerging virus?

Accepted Answer

A)   HIV
B)   H5N1
C)   West Nile
D)   SARS
E)   All of the above are considered emerging viruses.F) C) and E)
G) B) and D)

Question 19

A viroid is a naked, infectious _____molecule.

Accepted Answer

A)   protein
B)   DNA
C)   RNA
D)   fatty acid
E)   enzymeF) None of the above
G) D) and E)

Question 20

Citrus tristeza virus (CTV)  damages and kills susceptible citrus trees around the world. It can be spread by grafting of infected plants, and by aphids, insects with piercing mouthparts that they use to suck fluid from plants. Which of the following would be ineffective in controlling the spread of CTV?

Accepted Answer

A)   use of insecticides to control the aphids
B)   destruction of infected plants
C)   production of transgenic citrus lines using genes from resistant plants
D)   quarantine of fields with infected plants
E)   application of antibiotic drugs to citrus plantsF) A) and E)
G) C) and D)

Exam 17: Viruses, Bacteria, and Protists

A researcher infects a bacterium with a bacteriophage and notices that the infection does not immediately bring about the destruction of the host cell. Instead, the phage's genetic material is copied whenever the host reproduces. Which viral replication cycle is described here?

Correct Answer
verified

A virus is specific to a particular type of host cell because

Correct Answer
verified

Viroids and prions are alike in that both are infectious

Correct Answer
verified

A viroid is a naked, infectious _____molecule.

Correct Answer
verified

Correct Answer
verified

Which means of genetic recombination in bacteria is facilitated by use of a pilus?

Correct Answer
verified

Which of the following is an emerging virus?

Correct Answer
verified

Which of the following groups contains the foraminifera?

Correct Answer
verified

Which of the following statements regarding bacterial endospores is false?

Correct Answer
verified

Which of the following is not a characteristic of Paramecium?

Correct Answer
verified

What is the main structural difference between a virus and a viroid?

Correct Answer
verified

What evidence supports the idea that archaea are more closely related to eukaryotesthan to bacteria?

Correct Answer
verified

African sleeping sickness is caused by a

Correct Answer
verified

Which of the following is a characteristic only found in some viruses?

Correct Answer
verified

How are the algae traditionally categorized?

Correct Answer
verified

A bacteria's genetic material can include

Correct Answer
verified

Which type ofarchaea use a pigment related to the rhodopsin, a pigment found in human eyes, to absorb solar energy and pump chloride ions?

Correct Answer
verified

Which group of organisms are viroids(not viruses) most likely to parasitize?

Correct Answer
verified

One group of protozoans which are nonmotile, produce spores, and have disease-causing species is the

Correct Answer
verified

Animal viruses that have an envelope enter cells by

Correct Answer
verified

Exam 17: Viruses, Bacteria, and Protists

A researcher infects a bacterium with a bacteriophage and notices that the infection does not immediately bring about the destruction of the host cell. Instead, the phage's genetic material is copied whenever the host reproduces. Which viral replication cycle is described here?

Correct AnswerverifiedShow Answer

A virus is specific to a particular type of host cell because

Correct AnswerverifiedShow Answer

Viroids and prions are alike in that both are infectious

Correct AnswerverifiedShow Answer

A viroid is a naked, infectious _____molecule.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which means of genetic recombination in bacteria is facilitated by use of a pilus?

Correct AnswerverifiedShow Answer

Which of the following is an emerging virus?

Correct AnswerverifiedShow Answer

Which of the following groups contains the foraminifera?

Correct AnswerverifiedShow Answer

Which of the following statements regarding bacterial endospores is false?

Correct AnswerverifiedShow Answer

Which of the following is not a characteristic of Paramecium?

Correct AnswerverifiedShow Answer

What is the main structural difference between a virus and a viroid?

Correct AnswerverifiedShow Answer

What evidence supports the idea that archaea are more closely related to eukaryotesthan to bacteria?

Correct AnswerverifiedShow Answer

African sleeping sickness is caused by a

Correct AnswerverifiedShow Answer

Which of the following is a characteristic only found in some viruses?

Correct AnswerverifiedShow Answer

How are the algae traditionally categorized?

Correct AnswerverifiedShow Answer

A bacteria's genetic material can include

Correct AnswerverifiedShow Answer

Which type ofarchaea use a pigment related to the rhodopsin, a pigment found in human eyes, to absorb solar energy and pump chloride ions?

Correct AnswerverifiedShow Answer

Which group of organisms are viroids(not viruses) most likely to parasitize?

Correct AnswerverifiedShow Answer

One group of protozoans which are nonmotile, produce spores, and have disease-causing species is the

Correct AnswerverifiedShow Answer

Animal viruses that have an envelope enter cells by

Correct AnswerverifiedShow Answer

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