Question 1

All of the following are true of methanogens EXCEPT

Accepted Answer

A)  they produce methane from CO2 and H2.
B)  they live in the intestinal tracts of cows,humans,and termites.
C)  they live in swamps and marshes.
D)  their biogas may contribute to global warming.
E)  they require hot,acidic environments for methanogenesis.F) A) and C)
G) A) and B)

Question 2

A lichen is a symbiotic relationship between cyanobacteria and fungi.

Accepted Answer

A) True 
 B)False

Question 3

Which group of Archaea are chemoautotrophic anaerobes that use hydrogen as an electron donor and sulfur compounds as terminal electron acceptors?

Accepted Answer

A)  Halophiles
B)  Methanogens
C)  Thermoacidophiles
D)  CyanobacteriaE) None of the above
F) A) and B)

Question 4

In your analysis of a new bacterial species,you gram stained the bacteria and observed them under the microscope.The bacteria appear to have a round shape and a pink color.Based on this information,you would classify these bacteria as

Accepted Answer

A)  Gram-negative bacilli.
B)  Gram-positive spirilli.
C)  Gram-negative cocci.
D)  Gram-positive bacilli.
E)  Gram-positive cocci.F) A) and E)
G) All of the above

Question 5

Which description best describes the cell wall of a Gram-positive bacteria?

Accepted Answer

A)  It is composed of a single plasma membrane and a thin outer layer of peptidoglycan.
B)  It is composed of a double layer in the plasma membrane and a thin outer layer of peptidoglycan.
C)  It is composed of a thick inner layer of peptidoglycan and a double layer of plasma membrane on the outside.
D)  It is composed of a single plasma membrane and a thick outer layer of peptidoglycan.
E)  It is composed of a single plasma membrane and a thin outer layer of cellulose.F) All of the above
G) A) and E)

Question 6

Which of these is the best description of a virus?

Accepted Answer

A)  a noncellular living organism
B)  the smallest bacteria known
C)  a member of the kingdom Virusae
D)  an invasive cell
E)  chemical complexes of RNA or DNA protected by a protein shellF) B) and E)
G) A) and E)

Question 7

In an analysis of a new bacterial species,a microbiologist finds that the bacteria has an outer layer comprised primarily of proteins.This layer of proteins is known as a glycocalyx.

Accepted Answer

A) True 
 B)False

Question 8

Name the labeled structures of the virus pictured in this figure.  
A: ________
B: ________
C: ________
D: ________
E: ________

Accepted Answer

A: fiber protein B: ...

Question 9

Describe the lysogenic cycle of a bacteriophage and/or a prophage.Why do you think it would be useful to the virus to have this cycle?

Accepted Answer

Answers may vary.In the lysogenic cycle,...

Question 10

Pasteur chose the Latin root word for "virus" meaning

Accepted Answer

A)  extremely small.
B)  non-living.
C)  poison.
D)  contagious.
E)  particle.F) B) and D)
G) B) and E)

Question 11

Identify the correct sequence of events that occur during the reproduction of HIV.

Accepted Answer

A)  virus attaches to a host cell - the virus enters the cell - viral DNA is incorporated into the host DNA - reverse transcriptase occurs - viral / host DNA is turned into a viral mRNA code - the viral RNA forms into a mature virus - mature viruses leave the host cell
B)  virus attaches to a host cell - the virus enters the cell - reverse transcriptase occurs - viral DNA is incorporated into the host DNA - viral / host DNA is turned into a viral mRNA code - the viral RNA forms into a mature virus - mature viruses leave the host cell
C)  virus attaches to a host cell - the virus enters the cell - viral DNA is incorporated into the host DNA - reverse transcriptase occurs - the viral RNA forms into a mature virus - viral / host DNA is turned into a viral mRNA code - mature viruses leave the host cell
D)  virus attaches to a host cell - the virus enters the cell - viral / host DNA is turned into a viral mRNA code - viral DNA is incorporated into the host DNA - reverse transcriptase occurs - the viral RNA forms into a mature virus - mature viruses leave the host cellE) None of the above
F) B) and C)

Question 12

In your analysis of a newly discovered bacterial species,you find the bacteria reduce carbon dioxide to organic compounds but do not produce oxygen.The nutritional mode of this new bacterial species is most likely

Accepted Answer

A)  oxygenic photoautotroph.
B)  anoxygenic chemoautotroph.
C)  anoxygenic photoautotroph.
D)  oxygenic chemoautotoph.
E)  anoxygenic chemoheterotoph.F) A) and C)
G) B) and D)

Question 13

What is the correct sequence of events in viral reproduction?

Accepted Answer

A)  penetration,attachment,integration,biosynthesis,maturation,release
B)  endocytosis,uncoating,maturation,and release
C)  attachment,fusion,biosynthesis,maturation,and release
D)  attachment,penetration,biosynthesis,maturation and releaseE) A) and C)
F) None of the above

Question 14

You recently discovered a new photosynthetic bacterial cell.Based on your knowledge of prokaryotes,what else should be present in the cell?

Accepted Answer

A)  mitochondria
B)  chloroplasts
C)  many infolds of the plasma membrane
D)  additional plasmids
E)  viral DNAF) A) and E)
G) C) and D)

Question 15

The cycle of viral infection in which the viral DNA is integrated into the host's DNA is called the ________ cycle.

Accepted Answer

A)  lysogenic
B)  lysozyme
C)  lytic
D)  lysol
E)  lysosomeF) C) and E)
G) All of the above

Question 16

Pasteur's experiments are depicted in this diagram.Do the results of the first experiment confirm the prediction of Hypothesis A or Hypothesis B? Explain.

Accepted Answer

The growth in the flasks of the first ex...

Question 17

Prokaryotes that require high salt concentrations would be classified as

Accepted Answer

A)  archaeans.
B)  bacteria.
C)  cyanobacteria.
D)  viruses.
E)  thermoacidophiles.F) A) and B)
G) D) and E)

Question 18

Bacteriophages carry portions of bacterial DNA from one cell to another in a process called

Accepted Answer

A)  transformation.
B)  transduction.
C)  conjugation.
D)  infection.
E)  replication.F) All of the above
G) A) and C)

Question 19

A prokaryotic cell that contains branched-chain hydrocarbons linked to glycerol belongs to an archaean.

Accepted Answer

A) True 
 B)False

Question 20

Describe how halophiles metabolize nutrients in environments that contain a high salt concentration.

Accepted Answer

Halophiles require a high salt concentra...

Exam 20: Viruses,bacteria,and Archaea

Prokaryotes that require high salt concentrations would be classified as

Correct AnswerverifiedShow Answer

In an analysis of a new bacterial species,a microbiologist finds that the bacteria has an outer layer comprised primarily of proteins.This layer of proteins is known as a glycocalyx.

Correct AnswerverifiedShow Answer

Which of these is the best description of a virus?

Correct AnswerverifiedShow Answer

Pasteur's experiments are depicted in this diagram.Do the results of the first experiment confirm the prediction of Hypothesis A or Hypothesis B? Explain.

Correct AnswerverifiedThe growth in the flasks of the first ex...View AnswerShow Answer

You recently discovered a new photosynthetic bacterial cell.Based on your knowledge of prokaryotes,what else should be present in the cell?

Correct AnswerverifiedShow Answer

Which group of Archaea are chemoautotrophic anaerobes that use hydrogen as an electron donor and sulfur compounds as terminal electron acceptors?

Correct AnswerverifiedShow Answer

Describe the lysogenic cycle of a bacteriophage and/or a prophage.Why do you think it would be useful to the virus to have this cycle?

Correct AnswerverifiedAnswers may vary.In the lysogenic cycle,...View AnswerShow Answer

Bacteriophages carry portions of bacterial DNA from one cell to another in a process called

Correct AnswerverifiedShow Answer

A lichen is a symbiotic relationship between cyanobacteria and fungi.

Correct AnswerverifiedShow Answer

All of the following are true of methanogens EXCEPT

Correct AnswerverifiedShow Answer

The cycle of viral infection in which the viral DNA is integrated into the host's DNA is called the ________ cycle.

Correct AnswerverifiedShow Answer

Name the labeled structures of the virus pictured in this figure. A: ________ B: ________ C: ________ D: ________ E: ________

Correct AnswerverifiedA: fiber protein B: ...View AnswerShow Answer

Which description best describes the cell wall of a Gram-positive bacteria?

Correct AnswerverifiedShow Answer

In your analysis of a new bacterial species,you gram stained the bacteria and observed them under the microscope.The bacteria appear to have a round shape and a pink color.Based on this information,you would classify these bacteria as

Correct AnswerverifiedShow Answer

Identify the correct sequence of events that occur during the reproduction of HIV.

Correct AnswerverifiedShow Answer

A prokaryotic cell that contains branched-chain hydrocarbons linked to glycerol belongs to an archaean.

Correct AnswerverifiedShow Answer

In your analysis of a newly discovered bacterial species,you find the bacteria reduce carbon dioxide to organic compounds but do not produce oxygen.The nutritional mode of this new bacterial species is most likely

Correct AnswerverifiedShow Answer

Describe how halophiles metabolize nutrients in environments that contain a high salt concentration.

Correct AnswerverifiedHalophiles require a high salt concentra...View AnswerShow Answer

Pasteur chose the Latin root word for "virus" meaning

Correct AnswerverifiedShow Answer

What is the correct sequence of events in viral reproduction?

Correct AnswerverifiedShow Answer

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The growth in the flasks of the first ex...
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Correct Answer
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Answers may vary.In the lysogenic cycle,...
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Name the labeled structures of the virus pictured in this figure. A: B: C: D: E:

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A: fiber protein B: ...
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Correct Answer
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Halophiles require a high salt concentra...
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