BACTERIOPHAGES QUIZ

__________ protein keeps the prophage dormant and prevents virus reproduction.

Enhancer

Repressor

Promotor

Operator

TRUE ANSWER : ?
YOUR ANSWER : ?

In viruses with envelopes

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

the envelope and its imbedded proteins are derived from the host's membranes

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Antigenic variation in Salmonella anatum

Toxin production in Clostridium botulinum types C and D

All of these

Toxin production in Corynebacterium diphtheriae

TRUE ANSWER : ?
YOUR ANSWER : ?

T-even phage binding to E. coli probably involves

all of these

covalent bonds

electrostatic interaction

hydrophobic interaction

TRUE ANSWER : ?
YOUR ANSWER : ?

A bacterial defense mechanism against bacteriophage is called

restriction

concatamerization

lysogeny

polymerization

TRUE ANSWER : ?
YOUR ANSWER : ?

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

the tip of the pilus

the cell wall

lipopolysaccharide

the cell membrane

TRUE ANSWER : ?
YOUR ANSWER : ?

The procapsid is assembled with the aid of __________ proteins.

ladder

scaffolding

framing

form

TRUE ANSWER : ?
YOUR ANSWER : ?

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

plaque

pock

pox

all of these

TRUE ANSWER : ?
YOUR ANSWER : ?

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

All of these

Salmonella typhi

Vibrio cholerae

Staphylococcus aureus

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

T2

P22

T3

All of these

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YOUR ANSWER : ?