BACTERIOPHAGES QUIZ

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

T2

All of these

T3

P22

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

RNA replicase

RNA transcriptase

RNA ligase

RNA polymerase

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

Staphylococcus aureus

Salmonella typhi

Vibrio cholerae

All of these

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__________ is specifically able to have a long-term relationship with the host known as lysogeny.

RNA phage

Adsorbed virus

DNA phage

Temperate virus

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The process by which phage reproduction is initiated in lysogenized culture is called

integration

induction

repression

infection

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Which capsid symmetry is exhibited by most of the phages?

Icosahedral

Complex

None of these

Helical

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__________ protein keeps the prophage dormant and prevents virus reproduction.

Enhancer

Repressor

Operator

Promotor

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In viruses with envelopes

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

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

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

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

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The procapsid is assembled with the aid of __________ proteins.

ladder

scaffolding

framing

form

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A bacterial defense mechanism against bacteriophage is called

concatamerization

lysogeny

restriction

polymerization

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