Question 1

Consider again the discussion of "properties of life" and describe at least three distinct reasons why viruses are not classified as living organisms.

Accepted Answer

Answers may vary.The basic unit of life ...

Question 2

Eukarya are believed to have diverged from the bacterial line of descent.The Eukarya are,therefore,more closely related to the Bacteria than to the Archaea.

Accepted Answer

A) True 
 B)False

Question 3

Bacterial cells pick up free pieces of DNA that were secreted by live bacteria or released from dead bacteria in their environment.This process is called

Accepted Answer

A)  transformation.
B)  transduction.
C)  conjugation.
D)  infection.
E)  replication.F) C) and D)
G) D) and E)

Question 4

Which statement is true about prokaryotes?

Accepted Answer

A)  They contain a nucleus.
B)  They lack ribosomes.
C)  They usually lack a cell wall.
D)  They do not divide by mitosis.
E)  They contain a long,linear strand of DNA as the genetic material.F) C) and D)
G) None of the above

Question 5

Which of the following is a mismatch?

Accepted Answer

A)  thermophiles - live in extremely cold temperatures
B)  methanogens - prefer anaerobic environments
C)  halophiles - live in high salt environments
D)  thermoacidophiles - live in high temperatures and acidic environmentsE) A) and B)
F) All of the above

Question 6

An environmental change,such as exposure to ultraviolet light,may cause a lysogenic virus to enter a lytic cycle.

Accepted Answer

A) True 
 B)False

Question 7

A Gram-negative bacteria will have a peptidoglycan layer that is sandwiched between two plasma membranes and will stain purple.

Accepted Answer

A) True 
 B)False

Question 8

Viruses are categorized according to all of the following EXCEPT

Accepted Answer

A)  size and shape.
B)  their type of nucleic acid.
C)  the presence or absence of an envelope.
D)  their method of reproduction,whether asexual or sexual.E) C) and D)
F) A) and B)

Question 9

Study the life cycle diagram.Label B is the ________ life cycle.

Accepted Answer

A)  lysogenic
B)  sexual
C)  lytic
D)  alternation of generationsE) B) and D)
F) All of the above

Question 10

The cycle of viral infection that will rapidly result in the death of a bacterial cell is called the ________ cycle.

Accepted Answer

A)  lysogenic
B)  lysozyme
C)  lytic
D)  lysol
E)  lysosomeF) B) and D)
G) A) and B)

Question 11

Explain which features of cyanobacteria enable them to survive in a variety of environments.

Accepted Answer

Answers may vary.Cyanobacteria can posse...

Question 12

All of the following are means of genetic recombination in prokaryotes EXCEPT

Accepted Answer

A)  conjugation.
B)  transformation.
C)  transduction.
D)  crossing over.E) None of the above
F) B) and D)

Question 13

In order to infect a cell,a virus must

Accepted Answer

A)  inject its protein into the cell while the nucleic acid remains attached to the host cell surface.
B)  have a special protein on its surface that can interact with a protein on the surface of the host cell.
C)  actively burrow through the cell wall or cell membrane of the host cell to reach the cell's nucleus.
D)  produce a special extension of its cytoplasm when it comes into contact with the appropriate host cell.E) B) and D)
F) All of the above

Question 14

Chemoautotrophs oxidize which of the following to obtain the energy necessary to reduce carbon dioxide to an organic compound?

Accepted Answer

A)  hydrogen gas
B)  hydrogen sulfide
C)  ammonia
D)  nitrites
E)  All of the above.F) A) and D)
G) B) and E)

Question 15

Similarities between the archaea and eukarya include

Accepted Answer

A)  the same ribosomal proteins.
B)  similar tRNA.
C)  similar initiation of transcription.
D)  that they are more closely related to each other than to the bacteria.
E)  All of the choices are correct similarities.F) None of the above
G) A) and B)

Question 16

Influenza strains that sweep around the world often carry names such as H5N1 or H2N2.If they are both flu viruses,why do they differ in their H and N numbers?

Accepted Answer

A)  The H and N numbers indicate the geographical region in which the virus was discovered.
B)  The H and N numbers indicate the order in which the virus was discovered.
C)  The H and N numbers indicate the toxicity of the virus to humans and nonhumans.
D)  The H and N numbers indicate the type of glycoprotein spikes found in the viral envelope.E) A) and C)
F) B) and D)

Question 17

All of the following are true about HIV EXCEPT

Accepted Answer

A)  HIV carries RNA as its genetic material.
B)  HIV contains an enzyme called reverse transcriptase.
C)  HIV must reproduce immediately upon entering a host cell because it cannot survive a latent period.
D)  cDNA precedes double-stranded DNA.E) None of the above
F) A) and C)

Question 18

If a virus is latent,it

Accepted Answer

A)  cannot be a retrovirus.
B)  is not actively replicating.
C)  has not entered a lysogenic cycle.
D)  is gaining a new envelope via "budding."
E)  is easy to develop immunity against it.F) A) and B)
G) D) and E)

Question 19

Prokaryotes generally range in size from

Accepted Answer

A)  10-400 nm.
B)  20-300 mm.
C)  10-100 µm.
D)  1-10 µm.
E)  50-100 nm.F) B) and D)
G) A) and B)

Exam 20: Viruses,bacteria,and Archaea

Influenza strains that sweep around the world often carry names such as H₅N₁ or H₂N₂.If they are both flu viruses,why do they differ in their H and N numbers?

Correct Answer
verified

Viruses are categorized according to all of the following EXCEPT

Correct Answer
verified

Bacterial cells pick up free pieces of DNA that were secreted by live bacteria or released from dead bacteria in their environment.This process is called

Correct Answer
verified

Study the life cycle diagram.Label B is the ________ life cycle.

Correct Answer
verified

Chemoautotrophs oxidize which of the following to obtain the energy necessary to reduce carbon dioxide to an organic compound?

Correct Answer
verified

An environmental change,such as exposure to ultraviolet light,may cause a lysogenic virus to enter a lytic cycle.

Correct Answer
verified

The cycle of viral infection that will rapidly result in the death of a bacterial cell is called the ________ cycle.

Correct Answer
verified

All of the following are true about HIV EXCEPT

Correct Answer
verified

Similarities between the archaea and eukarya include

Correct Answer
verified

If a virus is latent,it

Correct Answer
verified

Which statement is true about prokaryotes?

Correct Answer
verified

Prokaryotes generally range in size from

Correct Answer
verified

A Gram-negative bacteria will have a peptidoglycan layer that is sandwiched between two plasma membranes and will stain purple.

Correct Answer
verified

Consider again the discussion of "properties of life" and describe at least three distinct reasons why viruses are not classified as living organisms.

Correct Answer
verified
Answers may vary.The basic unit of life ...
View Answer

Eukarya are believed to have diverged from the bacterial line of descent.The Eukarya are,therefore,more closely related to the Bacteria than to the Archaea.

Correct Answer
verified

In order to infect a cell,a virus must

Correct Answer
verified

Explain which features of cyanobacteria enable them to survive in a variety of environments.

Correct Answer
verified
Answers may vary.Cyanobacteria can posse...
View Answer

Which of the following is a mismatch?

Correct Answer
verified

All of the following are means of genetic recombination in prokaryotes EXCEPT

Correct Answer
verified

Exam 20: Viruses,bacteria,and Archaea

Influenza strains that sweep around the world often carry names such as H5N1 or H2N2.If they are both flu viruses,why do they differ in their H and N numbers?

Correct AnswerverifiedShow Answer

Viruses are categorized according to all of the following EXCEPT

Correct AnswerverifiedShow Answer

Bacterial cells pick up free pieces of DNA that were secreted by live bacteria or released from dead bacteria in their environment.This process is called

Correct AnswerverifiedShow Answer

Study the life cycle diagram.Label B is the ________ life cycle.

Correct AnswerverifiedShow Answer

Chemoautotrophs oxidize which of the following to obtain the energy necessary to reduce carbon dioxide to an organic compound?

Correct AnswerverifiedShow Answer

An environmental change,such as exposure to ultraviolet light,may cause a lysogenic virus to enter a lytic cycle.

Correct AnswerverifiedShow Answer

The cycle of viral infection that will rapidly result in the death of a bacterial cell is called the ________ cycle.

Correct AnswerverifiedShow Answer

All of the following are true about HIV EXCEPT

Correct AnswerverifiedShow Answer

Similarities between the archaea and eukarya include

Correct AnswerverifiedShow Answer

If a virus is latent,it

Correct AnswerverifiedShow Answer

Which statement is true about prokaryotes?

Correct AnswerverifiedShow Answer

Prokaryotes generally range in size from

Correct AnswerverifiedShow Answer

A Gram-negative bacteria will have a peptidoglycan layer that is sandwiched between two plasma membranes and will stain purple.

Correct AnswerverifiedShow Answer

Consider again the discussion of "properties of life" and describe at least three distinct reasons why viruses are not classified as living organisms.

Correct AnswerverifiedAnswers may vary.The basic unit of life ...View AnswerShow Answer

Eukarya are believed to have diverged from the bacterial line of descent.The Eukarya are,therefore,more closely related to the Bacteria than to the Archaea.

Correct AnswerverifiedShow Answer

In order to infect a cell,a virus must

Correct AnswerverifiedShow Answer

Explain which features of cyanobacteria enable them to survive in a variety of environments.

Correct AnswerverifiedAnswers may vary.Cyanobacteria can posse...View AnswerShow Answer

Which of the following is a mismatch?

Correct AnswerverifiedShow Answer

All of the following are means of genetic recombination in prokaryotes EXCEPT

Correct AnswerverifiedShow Answer

Influenza strains that sweep around the world often carry names such as H₅N₁ or H₂N₂.If they are both flu viruses,why do they differ in their H and N numbers?

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
verified
Answers may vary.The basic unit of life ...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Answers may vary.Cyanobacteria can posse...
View Answer

Correct Answer
verified

Correct Answer
verified