BACTERIOPHAGES QUIZ

Which of the following properties is due to lysogenic conversion by phages?

Toxin production in Clostridium botulinum types C and D

Antigenic variation in Salmonella anatum

Toxin production in Corynebacterium diphtheriae

All of these

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

infection

induction

repression

integration

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

All of these

T3

T2

P22

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The procapsid is assembled with the aid of __________ proteins.

framing

scaffolding

form

ladder

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__________ protein keeps the prophage dormant and prevents virus reproduction.

Repressor

Operator

Enhancer

Promotor

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

RNA polymerase

RNA replicase

RNA transcriptase

RNA ligase

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

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

Phage structural proteins

All of these

Proteins involved in cell lysis and phage release

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A bacterial defense mechanism against bacteriophage is called

concatamerization

polymerization

restriction

lysogeny

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Which capsid symmetry is exhibited by most of the phages?

Complex

None of these

Icosahedral

Helical

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T-even phage binding to E. coli probably involves

covalent bonds

all of these

hydrophobic interaction

electrostatic interaction

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