AP Bio Ch. 19 Study Guide Test Your Knowledge
Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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The study of viruses has provided information on all of the following topics
except
a. | the molecular biology of all organisms | b. | the sexual replicative cycles of a
virus | c. | new techniques for manipulating genes | d. | the causes of diseases | e. | the role of mutation
in the relationship between host and virus |
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2.
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Beijerinck concluded that the cause of tobacco mosaic disease was not a
filterable toxin because
a. | the infectious agent could not be cultivated on nutrient media | b. | a plant sprayed with
filtered sap would develop the disease | c. | the infectious agent could be
crystallized | d. | the infectious agent replicated and could be passed on from a plant infected with
filtered sap | e. | the filtered sap was infectious even though microbes could not be found in
it |
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3.
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Viral genomes may be any of the following except
a. | single-stranded DNA | b. | double-stranded RNA | c. | misfolded infectious
proteins | d. | a linear single-stranded RNA molecule | e. | a circular double-stranded DNA
molecule |
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4.
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The reverse transcriptase carried by retroviruses
a. | uses viral RNA as a template for making complementary RNA strands | b. | protects viral DNA
from degradation by restriction enzymes | c. | destroys the host cell DNA | d. | translates RNA inot
proteins | e. | uses viral RNA as a template for DNA synthesis |
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5.
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Virus particles are formed from capsid proteins and nucleic acid
molecules
a. | by spontaneous assembly | b. | at the direction of viral
enzymes | c. | using host cell enzymes | d. | using ATP stored in the tail
piece | e. | by both b. and d. |
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6.
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A virus has a base ratio of (A + G) / (U + C) = 1.
What type of virus is
this?
a. | a single-stranded DNA virus | b. | a single-stranded RNA virus | c. | a double-stranded
DNA virus | d. | a double-stranded RNA virus | e. | a retrovirus |
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7.
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Vertical transmission of a plant virus involves
a. | movement of viral particles through plasmodesmata | b. | inheritance of an
infection from a parent | c. | a bacteriophage transmitting viral
particles | d. | insects carrying viral particles between plants | e. | the transfer of
filtered sap |
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8.
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Bacteria defend against viral infection
a. | with antibiotics they produce | b. | with restriction enzymes that chop up foreign
DNA | c. | through the transfer of R plasmids | d. | with reverse transcriptase | e. | through the
incorporation of viral DNA into the bacterial chromosome |
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9.
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Drugs that are effective in treating viral infections
a. | induce the body to produce antibodies | b. | inhibit the action of viral
ribosomes | c. | interfere with the synthesis of viral nucleic acid | d. | change the
cell-recognition sites on the host cell | e. | are vaccines that stimulate the mmune system to
create immunity |
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10.
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Which of the following is true of prions?
a. | they are emerging viruses | b. | they are fast-acting infectious
agents | c. | they probably evolved from transposons | d. | they are infectious proteins that may convert
brain proteins into misfolded forms | e. | they may be tranferred between animals by
sexual contact |
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11.
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An RNA viral genome may be replicated by
a. | DNA polymerase from the host | b. | RNA polymerase coded by viral genes and carried
in the viral capsid | c. | reverse transcriptase that synthesizes
RNA | d. | RNA polymerase from the host | e. | restriction enzymes from the
host |
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