Question 1

Which means of genetic recombination in bacteria often makes use of pili?

Accepted Answer

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

Question 2

A chain of spherical bacterial cells is called a ___________.

Accepted Answer

A)   streptococcus
B)   staphylococcus
C)   streptobacillus
D)   diplococcus
E)   streptospirillumF) C) and D)
G) A) and B)

Question 3

Viroids and prions are alike in that both are infectious ________.

Accepted Answer

A)   cell types
B)   proteins
C)   molecules
D)   DNA
E)   RNAF) B) and C)
G) C) and D)

Question 4

What evidence helps supports the endosymbiosis theory?

Accepted Answer

A)   a single membrane around the nucleus within a cell
B)   a double membrane surrounding the nucleus within a cell
C)   a single membrane surrounding the mitochondria
D)   a single membrane surrounding the chloroplast
E)   a double membrane surrounding the mitochnodria and chloroplastF) B) and D)
G) D) and E)

Question 5

Some bacteria carry out a metabolic process known as fermentation, and

Accepted Answer

A)   consume acids.
B)   produce acids.
C)   produce oxygen.
D)   consume oxygen.
E)   consume both acids and oxygen.F) A) and B)
G) A) and C)

Question 6

One group of protozoans which are non-motile, produce spores, and have disease-causing species is the ________.

Accepted Answer

A)   foraminiferans
B)   trypanosomes
C)   sporozoans
D)   amoeboids
E)   radiolariansF) A) and D)
G) B) and D)

Question 7

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 spike or a portion of the capsid adheres 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) A) and B)
G) A) and C)

Question 8

Which sporozoan characteristic is most consistent with a parasitic lifestyle?

Accepted Answer

A)   lack of motility
B)   chemoheterotrophism
C)   unicellular
D)   lack of light-absorbing pigment
E)   eukaryoticF) A) and B)
G) A) and E)

Question 9

Which statement about slime molds and water molds is incorrect?

Accepted Answer

A)   Both are eukaryotes.
B)   Both have flagellated cells at some time in their life cycles.
C)   Both form spores.
D)   Both are chemoheterotrophs.
E)   Both are fungi.F) A) and C)
G) A) and B)

Question 10

Support for the endosymbiotic hypothesis is provided by all of the following except

Accepted Answer

A)   double membranes around mitochondria and chloroplasts.
B)   mitochondria and chloroplasts have their own genomes.
C)   mitochondria and chloroplasts can synthesize proteins.
D)   mitochondria and chloroplast ribosomes are encoded by genes that are very similar to bacterial ribosome genes.
E)   mitochondria and chloroplasts contribute to different metabolic processes in the eukaryotic cell.F) A) and B)
G) A) and D)

Question 11

Your task as a researcher is to develop a new drug to prevent retrovirus infections in newly exposed individuals. Which of the means listed is likely to be the most effective?

Accepted Answer

A)   blocking enzyme action
B)   destroying the viral genome
C)   dissolving the capsid
D)   preventing conjugation
E)   disrupting the viral envelopeF) B) and C)
G) All of the above

Question 12

Which of the following contains no photosynthetic organisms?

Accepted Answer

A)   protists
B)   bacteria
C)   archaea
D)   zooflagellates
E)   prokaryotesF) D) and E)
G) C) and D)

Question 13

Retroviruses _____________.

Accepted Answer

A)   contain DNA
B)   contain reverse transcriptase
C)   produce RNA from DNA
D)   only invade plants
E)   produce protein directly from DNAF) C) and D)
G) None of the above

Question 14

Citrus tristeza virus (CTV)  damages and kills susceptible citrus trees around the world. It can by 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 not limit 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) A) and C)

Question 15

Colchicine is a drug that blocks formation of the mitotic spindle apparatus. What would you expect if you applied colchicine to a petri dish of bacteria?

Accepted Answer

A)   The bacteria would be unable to divide, because they could not form the spindle apparatus for mitosis.
B)   The bacteria would continue to divide, because they carry out mitosis without a spindle apparatus.
C)   The bacteria would continue to divide, because they carry out binary fission, which does not require a spindle apparatus.
D)   The bacteria would be unable to divide, because they would be unable to form new cell wall partitions.
E)   The bacteria would increase their rate of mitosis, so the number of cells would rapidly increase.F) A) and D)
G) A) and E)

Question 16

Which of the following statements is incorrect for all viruses?

Accepted Answer

A)   Viruses have an inner core of nucleic acid.
B)   Viruses have a protein capsid.
C)   Viruses are obligate intracellular parasites.
D)   Viruses have envelopes.
E)   Viral genomes may consist of either DNA or RNA.F) C) and D)
G) A) and C)

Question 17

Without bacteria in the environment

Accepted Answer

A)   adequate amounts of carbon would not be available to living organisms.
B)   plants would not be able to grow due to lack of nitrogen.
C)   bioremediation would have limited use as a tool to clean up pollutants.
D)   there would be a shortage of decomposer organisms.
E)   All of the choices are correct.F) A) and E)
G) A) and D)

Exam 17: The Microorganisms: Viruses, Bacteria, and Protists

Support for the endosymbiotic hypothesis is provided by all of the following except

Correct Answer
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Which statement about slime molds and water molds is incorrect?

Correct Answer
verified

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

Correct Answer
verified

What evidence helps supports the endosymbiosis theory?

Correct Answer
verified

Which sporozoan characteristic is most consistent with a parasitic lifestyle?

Correct Answer
verified

Retroviruses _____________.

Correct Answer
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Without bacteria in the environment

Correct Answer
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Which of the following statements is incorrect for all viruses?

Correct Answer
verified

One group of protozoans which are non-motile, produce spores, and have disease-causing species is the ________.

Correct Answer
verified

Some bacteria carry out a metabolic process known as fermentation, and

Correct Answer
verified

Your task as a researcher is to develop a new drug to prevent retrovirus infections in newly exposed individuals. Which of the means listed is likely to be the most effective?

Correct Answer
verified

Colchicine is a drug that blocks formation of the mitotic spindle apparatus. What would you expect if you applied colchicine to a petri dish of bacteria?

Correct Answer
verified

A chain of spherical bacterial cells is called a ___________.

Correct Answer
verified

Citrus tristeza virus (CTV) damages and kills susceptible citrus trees around the world. It can by 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 not limit the spread of CTV?

Correct Answer
verified

Which of the following contains no photosynthetic organisms?

Correct Answer
verified

Which means of genetic recombination in bacteria often makes use of pili?

Correct Answer
verified

Viroids and prions are alike in that both are infectious ________.

Correct Answer
verified

Exam 17: The Microorganisms: Viruses, Bacteria, and Protists

Support for the endosymbiotic hypothesis is provided by all of the following except

Correct AnswerverifiedShow Answer

Which statement about slime molds and water molds is incorrect?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What evidence helps supports the endosymbiosis theory?

Correct AnswerverifiedShow Answer

Which sporozoan characteristic is most consistent with a parasitic lifestyle?

Correct AnswerverifiedShow Answer

Retroviruses _____________.

Correct AnswerverifiedShow Answer

Without bacteria in the environment

Correct AnswerverifiedShow Answer

Which of the following statements is incorrect for all viruses?

Correct AnswerverifiedShow Answer

One group of protozoans which are non-motile, produce spores, and have disease-causing species is the ________.

Correct AnswerverifiedShow Answer

Some bacteria carry out a metabolic process known as fermentation, and

Correct AnswerverifiedShow Answer

Your task as a researcher is to develop a new drug to prevent retrovirus infections in newly exposed individuals. Which of the means listed is likely to be the most effective?

Correct AnswerverifiedShow Answer

Colchicine is a drug that blocks formation of the mitotic spindle apparatus. What would you expect if you applied colchicine to a petri dish of bacteria?

Correct AnswerverifiedShow Answer

A chain of spherical bacterial cells is called a ___________.

Correct AnswerverifiedShow Answer

Citrus tristeza virus (CTV) damages and kills susceptible citrus trees around the world. It can by 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 not limit the spread of CTV?

Correct AnswerverifiedShow Answer

Which of the following contains no photosynthetic organisms?

Correct AnswerverifiedShow Answer

Which means of genetic recombination in bacteria often makes use of pili?

Correct AnswerverifiedShow Answer

Viroids and prions are alike in that both are infectious ________.

Correct AnswerverifiedShow Answer

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