BACTERIOPHAGES QUIZ

In viruses with envelopes

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

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

TRUE ANSWER : ?
YOUR ANSWER : ?

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

the tip of the pilus

lipopolysaccharide

the cell wall

the cell membrane

TRUE ANSWER : ?
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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

TRUE ANSWER : ?
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T-even phage binding to E. coli probably involves

covalent bonds

all of these

hydrophobic interaction

electrostatic interaction

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

All of these

T3

T2

P22

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

Toxin production in Corynebacterium diphtheriae

Antigenic variation in Salmonella anatum

Toxin production in Clostridium botulinum types C and D

All of these

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__________ protein keeps the prophage dormant and prevents virus reproduction.

Operator

Repressor

Enhancer

Promotor

TRUE ANSWER : ?
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Area of lysis on a bacterial lawn culture produced by a phage is known as

pox

all of these

pock

plaque

TRUE ANSWER : ?
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The procapsid is assembled with the aid of __________ proteins.

scaffolding

ladder

framing

form

TRUE ANSWER : ?
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Which capsid symmetry is exhibited by most of the phages?

None of these

Helical

Complex

Icosahedral

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