Bacteriophages

__________ protein keeps the prophage dormant and prevents virus reproduction.

A:

Operator

B:

Promotor

C:

Repressor

D:

Enhancer

Answer: C

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Which of the following bacteria can be typed by phage typing method?

A:

Staphylococcus aureus

B:

Salmonella typhi

C:

Vibrio cholerae

D:

All of these

Answer: D

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In viruses with envelopes

A:

the envelope and the embedded proteins are encoded by the viral nucleic acid

B:

the envelope is derived from the host but it contains embedded proteins coded by the viral nucleic acid

C:

the envelope is coded by the viral nucleic acids, but the proteins come from the host's membrane proteins

D:

the envelope and its imbedded proteins are derived from the host's membranes

Answer: B

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One of the first enzymes synthesized by many bacteriophage is __________ , an RNA-dependent RNA polymerase.

A:

RNA transcriptase

B:

RNA polymerase

C:

RNA ligase

D:

RNA replicase

Answer: D

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Contractile sheath of the tail is present in which of the following phages?

A:

T3

B:

T2

C:

P22

D:

All of these

Answer: B

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Questions for: Bacteriophages