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

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