Bacteriophages
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A
bacterial defense mechanism against bacteriophage is called:
a.
concatamerization
b.
polymerization
c. restriction
d.
lysogeny
Which
of the following bacteria can be typed by phage typing method?
a.
Staphylococcus aureus
b.
Salmonella typhi
c.
Vibrio cholerae
d. All of these
__________
protein keeps the prophage dormant and prevents virus.
reproduction.
a.
Operator
b.
Promotor
c. Repressor
d.
Enhancer
The
procapsid is assembled with the aid of __________ proteins.
a.
ladder
b.
framing
c. scaffolding
d.
form
Contractile
sheath of the tail is present in which of the following phages?
a.
T3
b. T2
c.
P22
d.
All of these
The
process by which phage reproduction is initiated in lysogenized culture is
called
a.
infection
b.
integration
c.
repression
d. induction
Area
of lysis on a bacterial lawn culture produced by a phage is known as__________.
a.
pock
b. plaque
c.
pox
d.
all of these
One
of the first enzymes synthesized by many bacteriophage is __________, an
RNA-dependent RNA polymerase.
a.
RNA transcriptase
b.
RNA polymerase
c.
RNA ligase
d. RNA replicase
In
viruses with envelopes__________.
a.
the envelope and the embedded proteins are encoded by the viral nucleic acid
b. the envelope is
derived from the host but it contains embedded proteins coded by the viral
nucleic acid
c.
the envelope is coded by the viral nucleic acids, but the proteins come from
the host's membrane proteins
d.
the envelope and its imbedded proteins are derived from the host's membranes
Which
of the following is/are synthesized from late mRNA?
a.
Phage structural proteins
b.
Proteins that help with phage assembly without becoming part of the virion
structure
c.
Proteins involved in cell lysis and phage release
d. All of the above
Which
capsid symmetry is exhibited by most of the phages?
a.
Helical
b. Icosahedral
c.
Complex
d.
None of these
__________
is specifically able to have a long-term relationship with the host known as
lysogeny.
a. Temperate virus
b.
Adsorbed virus
c.
RNA phage
d.
DNA phage
Which
of the following properties is due to lysogenic conversion by phages?
a.
Toxin production in Corynebacterium diphtheriae
b.
Toxin production in Clostridium botulinum types C and D
c.
Antigenic variation in Salmonella anatum
d. All of the above
T-even
phage binding to E. coli probably involves__________.
a. electrostatic
interaction
b.
hydrophobic interaction
c.
covalent bonds
d.
all of these
The
filamentous bacteriopohage infect male E. coli cells by attaching to
__________.
a.
lipopolysaccharide
b.
the cell wall
c. the tip of the
pilus
d.
the cell membrane