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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: Introduction and General Characteristics

True or False Quiz



1

Phage contain either DNA or RNA, but not both.
A)True
B)False
2

Some viral chromosomes can maintain either a linear or a circular form.
A)True
B)False
3

Capsids are constructed of protomers that self-assemble through covalent bonds.
A)True
B)False
4

Phages can only reproduce within living cells.
A)True
B)False
5

Louis Pasteur used the term virus for any living infectious disease agent.
A)True
B)False
6

Some plant viruses can be transmitted only if a diseased part is grafted onto a healthy plant.
A)True
B)False
7

The number of plaque-forming units is equal to the number of phage particles.
A)True
B)False
8

Most viruses can be visualized with the light microscope.
A)True
B)False
9

The smallest viruses are a little larger than ribososmes.
A)True
B)False
10

The capsid aids in virus transfer between host cells.
A)True
B)False
11

No specific factors are required for capsid self-assembly.
A)True
B)False
12

Besides the normal nucleotides found in DNA, many virus DNAs contain unusual bases.
A)True
B)False
13

Eucaryotic mRNA is capped and polyadenylated. Although positive-sense RNA viruses resemble mRNA, it is not capped or polyadenylated.
A)True
B)False
14

The influenza virus uses RNA as its genetic material and carries an RNA-dependent RNA polymerase which acts both as a replicase and as an RNA transcriptase that synthesizes mRNA under the direction of its RNA genome.
A)True
B)False
15

One hypothesis for the origin of viruses is that viruses represent cellular nucleic acids that have become partially independent of the cell.
A)True
B)False
16

Virus family names end in virinae.
A)True
B)False








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