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Microbiology, 5/e

Lansing M Prescott, Augustana College
Donald A Klein, Colorado State University
John P Harley, Eastern Kentucky University

The Viruses: Bacteriophages

True or False


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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