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Bacteriophages

Bacteriophages
Which capsid symmetry is exhibited by most of the phages?

Icosahedral
Helical
None of these
Complex

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

Toxin production in Clostridium botulinum types C and D
All of these
Toxin production in Corynebacterium diphtheriae
Antigenic variation in Salmonella anatum

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

DNA phage
Adsorbed virus
Temperate virus
RNA phage

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Bacteriophages
__________ protein keeps the prophage dormant and prevents virus reproduction.

Enhancer
Promotor
Repressor
Operator

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Bacteriophages
A bacterial defense mechanism against bacteriophage is called

polymerization
lysogeny
restriction
concatamerization

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

T3
All of these
T2
P22

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