BACTERIOPHAGES QUIZ

A bacterial defense mechanism against bacteriophage is called

polymerization

lysogeny

restriction

concatamerization

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

Salmonella typhi

Staphylococcus aureus

All of these

Vibrio cholerae

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Which of the following is/are synthesized from late mRNA?

Phage structural proteins

Proteins involved in cell lysis and phage release

Proteins that help with phage assembly without becoming part of the virion structure

All of these

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Area of lysis on a bacterial lawn culture produced by a phage is known as

pock

pox

all of these

plaque

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

induction

repression

infection

integration

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The procapsid is assembled with the aid of __________ proteins.

form

framing

ladder

scaffolding

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

RNA ligase

RNA transcriptase

RNA polymerase

RNA replicase

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__________ protein keeps the prophage dormant and prevents virus reproduction.

Repressor

Operator

Promotor

Enhancer

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In viruses with envelopes

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

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

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

P22

All of these

T3

T2

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