Microbiology - Viruses

Exercise :: Viruses - Section 1

26. 

Which of the following may affect proteins and nucleic acids, but not viruses?

A. Denaturation
B. Enzyme treatment
C. Pressure
D. All of these

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

27. 

The viral DNA of the temperate phage, instead of taking over the functions of the cell's genes, is incorporated into the host DNA and becomes a prophage in the bacterial chromosome, acting as a gene. This happens in

A. lysogeny
B. spontaneous induction
C. lytic phase
D. none of these

Answer: Option A

Explanation:

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28. 

Which of the following statements is not true of viruses?

A. Viruses have been successfully grown in pure cultures in test tubes
B. All viruses are obligatory intracellular parasites
C. All viruses have either DNA or RNA as their genetic material
D. Viruses probably arose from small fragments of cellular chromosomes

Answer: Option A

Explanation:

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29. 

Which of the following viruses belong/s to family caliciviridae?

A. Hepatitis B virus
B. Hepatitis D virus
C. Hepatitis E virus
D. All of these

Answer: Option C

Explanation:

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30. 

In the simplest capsid, there is a capsomere at each of the 12 vertices; this capsomere, which is surrounded by five other capsomeres, is termed a

A. penton
B. polyhedra
C. icosahedral
D. helical

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.