Microbiology 020 - General Microbiology » Fall 2021 » Viruses 2

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Question #1
What percentage of human DNA is thought to consist of viral DNA sequences?
A.   1
B.   0.08
C.   45
D.   8
Question #2
The host cells that viruses can infect are determined by the ________.
A.   receptors on the host cells
B.   proximity of host cells
C.   DNA in host cells
D.   concentration of host cells in vicinity
Question #3
The general steps in a viral multiplication cycle are ________.
A.   adsorption, penetration, synthesis, assembly, and release
B.   endocytosis, uncoating, replication, assembly, and budding
C.   endocytosis, penetration, replication, maturation, and exocytosis
D.   adsorption, uncoating, duplication, assembly, and penetration
Question #4
When phage nucleic acid is incorporated into the nucleic acid of its host cell and is replicated when the host DNA is replicated, this is considered part of which cycle?
A.   Lysogenic cycle
B.   Virulence cycle
C.   Cell cycle
D.   Multiplication cycle
E.   Lytic cycle
Question #5
A virus that undergoes lysogeny is a/an _________.
A.   animal virus
B.   DNA virus
C.   intemperate phage
D.   temperate phage
E.   T-even phage
Question #6
Clear patches in cell cultures that indicate sites of virus infection are called ________.
A.   prions
B.   pocks
C.   colonies
D.   plaques
Question #7
What is the source of enveloped viruses’ envelopes?
A.   The host cell membrane
B.   The DNA inside the virus
C.   The capsid
D.   The viral enzymes

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