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Bacteriophages

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

Helical
Complex
None of these
Icosahedral

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

Staphylococcus aureus
All of these
Salmonella typhi
Vibrio cholerae

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Bacteriophages
The filamentous bacteriopohage infect male E. coli cells by attaching to

the cell wall
the tip of the pilus
the cell membrane
lipopolysaccharide

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

Repressor
Operator
Enhancer
Promotor

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

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

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

Phage structural proteins
Proteins that help with phage assembly without becoming part of the virion structure
All of these
Proteins involved in cell lysis and phage release

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