Question 1

An environmental change, such as exposure to ultraviolet light, may cause a lysogenic virus to enter a lytic cycle. --2013

Accepted Answer

A) True 
 B)False

Question 2

Many microbiologists prefer to describe viruses as being "activated" rather than "living." Consider again the discussion of "properties of life" and describe at least three distinct reasons why the term "activated" is more appropriate.

Accepted Answer

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

Question 3

A lichen is a symbiotic relationship between cyanobacteria and fungi.

Accepted Answer

A) True 
 B)False

Question 4

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 5

An enveloped virus enters a host cell by

Accepted Answer

A)   injecting its DNA or RNA into the host cell.
B)   fusion of its envelope with the host cell's plasma envelope.
C)   endocytosis.
D)   Any of the choices are correct.
E)   Attaching to the host cell's membrane and then injecting its DNA or RNA into the host cell.F) A) and C)
G) A) and E)

Question 6

Similarities between the archaea and eukarya include

Accepted Answer

A)   same ribosomal proteins.
B)   similar tRNA.
C)   similar initiation of transcription.
D)   All of the choices are correct similarities.
E)   are closer related to each other than to the bacteria.F) B) and E)
G) A) and B)

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

Which of the following is not part of the reproduction cycle of HIV?

Accepted Answer

A)   Reverse transcription of the viral RNA
B)   Reverse transcription of the viral DNA
C)   Maturation of the viruses
D)   Biosynthesis of the viral mRNAE) B) and C)
F) A) and D)

Question 9

Pasteur chose the Latin root word for "virus" meaning

Accepted Answer

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

Question 10

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 double layer in the plasma membrane and a thick outer layer of peptidoglycan.
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) C) and E)
G) D) and E)

Question 11

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

Accepted Answer

Answers may vary. Cyanobacteria can poss...

Exam 20: Viruses, Bacteria, and Archaea

An enveloped virus enters a host cell by

Correct Answer
verified

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

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

Correct Answer
verified

An environmental change, such as exposure to ultraviolet light, may cause a lysogenic virus to enter a lytic cycle. --2013

Correct Answer
verified

Similarities between the archaea and eukarya include

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

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

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

A lichen is a symbiotic relationship between cyanobacteria and fungi.

Correct Answer
verified

Which of the following is not part of the reproduction cycle of HIV?

Correct Answer
verified

Pasteur chose the Latin root word for "virus" meaning

Correct Answer
verified

Many microbiologists prefer to describe viruses as being "activated" rather than "living." Consider again the discussion of "properties of life" and describe at least three distinct reasons why the term "activated" is more appropriate.

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

Exam 20: Viruses, Bacteria, and Archaea

An enveloped virus enters a host cell by

Correct AnswerverifiedShow 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

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

Correct AnswerverifiedShow Answer

An environmental change, such as exposure to ultraviolet light, may cause a lysogenic virus to enter a lytic cycle. --2013

Correct AnswerverifiedShow Answer

Similarities between the archaea and eukarya include

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

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

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

A lichen is a symbiotic relationship between cyanobacteria and fungi.

Correct AnswerverifiedShow Answer

Which of the following is not part of the reproduction cycle of HIV?

Correct AnswerverifiedShow Answer

Pasteur chose the Latin root word for "virus" meaning

Correct AnswerverifiedShow Answer

Many microbiologists prefer to describe viruses as being "activated" rather than "living." Consider again the discussion of "properties of life" and describe at least three distinct reasons why the term "activated" is more appropriate.

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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