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True or False
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1
Since a bacteriophage cannot independently reproduce itself, the phage takes over its host cell and forces the host to reproduce it.
A)True
B)False
2
The bacteriophages have been the most intensely studied viruses.
A)True
B)False
3
Most bacteriophages have RNA.
A)True
B)False
4
The most complex bacteriophage have contractile tails, for example, the T-even phages of E. coli.
A)True
B)False
5
Marine viruses are about ten times more plentiful than marine bacteria. True/false
A)True
B)False
6
Up to 70% of marine procaryotes may be infected by phages.
A)True
B)False
7
Phages are capable of actively seeking out host cells to infect.
A)True
B)False
8
Bacteriophage fasten to specific receptor sites on the host.
A)True
B)False
9
The tail tube of the T-even phage may interact with the plasma membrane to form a pore through which the DNA passes.
A)True
B)False
10
Some early virus-specific enzymes degrade host DNA to nucleotides, thereby simultaneously halting host gene expression and providing raw material for virus DNA synthesis.
A)True
B)False
11
Bacterial genes with related functions are usually clustered together on the phage genome.
A)True
B)False
12
If all the linear pieces of DNA in a T4 phage population were coiled into circles, the DNA circles would have identical gene sequences.
A)True
B)False
13
Filamentous phage exit the bacterial cell through a lytic process. True/false
A)True
B)False
14
MS2 and Qb are small, tailless, icosahedral ssRNA phages of E. coli that have only 3 or 4 genes.
A)True
B)False
15
Only one double-stranded RNA phage has been discovered.
A)True
B)False
16
Immunity to superinfection means that an organism infected by one phage cannot be infected by any others.
A)True
B)False
17
When Salmonella is infected by an epsilon phage, the structure of its outer lipopolysaccharide layer may be modified.
A)True
B)False
18
Lambda DNA is replicated by both bidirectional and rolling-circle methods.
A)True
B)False
19
All temperate phages exist as integrated prophages in the lysogen.
A)True
B)False





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