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Microbiology, Fifth Edition
Microbiology, 5/e
Lansing M Prescott, Augustana College
Donald A Klein, Colorado State University
John P Harley, Eastern Kentucky University
The Viruses: Viruses of Eucaryotes

True or False



1

Animal virus reproduction is similar to that of the bacteriophages, in having the same series of phases.
A)True
B)False
2

Most plant viruses are DNA viruses.
A)True
B)False
3

Measles virus receptors are present in most tissues whereas poliovirus receptors are present in only a select few.
A)True
B)False
4

Viruses trick the host cell by attaching to surface molecules that are normally taken up by endocytosis; thus, they are actively carried into the cell.
A)True
B)False
5

Some viruses use their RNA genome as a giant mRNA, and host ribosomes synthesize an enormous peptide that is then cleaved or processed by both host and viral encoded enzymes to form the proper polypeptides.
A)True
B)False
6

Some viruses carry their own tRNA which serves as the primer required for nucleic acid synthesis.
A)True
B)False
7

Some cancers are not solid, but cell suspensions.
A)True
B)False
8

Cancer-causing genes or oncogenes are directly involved in carcinogenesis and are always contributed by a virus.
A)True
B)False
9

Plant viruses are easy to cultivate and purify.
A)True
B)False
10

A few nucleotide changes in two short regions on the potato spindle-tuber viroid are believed to alter the shape of the rod and thus its ability to cause disease.
A)True
B)False
11

Some doubters of the protein-only hypothesis for prions think that prions somehow either directly aid in infectious agent such as an unknown virus or increase susceptibility to the agent.
A)True
B)False
12

A cellular form of the prion is found in vertebrates.
A)True
B)False
13

Viruses may carry promoters that stimulate cellular oncogenes.
A)True
B)False
14

Some viruses inject only their nucleic acid, whereas others must ensure that a virus-associated RNA or DNA polymerase also enters the host cell along with the virus genome.
A)True
B)False
15

Enveloped virions are usually released upon cell lysis.
A)True
B)False








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