3 SEPTEMBER 2021 CURRENT AFFAIRS QUIZ

T-even phage binding to E. coli probably involves

hydrophobic interaction

all of these

electrostatic interaction

covalent bonds

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

All of these

P22

T3

T2

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

DNA phage

Temperate virus

Adsorbed virus

RNA phage

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

RNA replicase

RNA ligase

RNA transcriptase

RNA polymerase

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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 and the embedded proteins are encoded by the viral nucleic acid

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

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

induction

integration

repression

infection

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Which capsid symmetry is exhibited by most of the phages?

Icosahedral

Complex

Helical

None of these

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__________ protein keeps the prophage dormant and prevents virus reproduction.

Promotor

Enhancer

Repressor

Operator

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A bacterial defense mechanism against bacteriophage is called

concatamerization

restriction

polymerization

lysogeny

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

all of these

pock

plaque

pox

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