Chapter 21: Q. 28 (page 533)
Although plant viruses cannot infect humans, what are some of the ways in which they affect humans?
Short Answer
Plant viruses infect crops, resulting in crop failure and significant economic losses.
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Chapter 21: Q. 28 (page 533)
Although plant viruses cannot infect humans, what are some of the ways in which they affect humans?
Plant viruses infect crops, resulting in crop failure and significant economic losses.
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The observation that the bacteria genus Chlamydia contains species that can only survive as intracellular parasites supports which viral origin hypothesis?
a. Progressive
b. Regressive
c. Self-replicating
d. Virus-first
Which statement is true?
a. A virion contains DNA and RNA.
b. Viruses are acellular.
c. Viruses replicate outside of the cell.
d. Most viruses are easily visualized with a light microscope.
How are viroids like viruses?
Influenza virus is packaged in a viral envelope that fuses with the plasma membrane. This way, the virus can exit the host cell without killing it. What advantage does the virus gain by keeping the host cell alive?

Which statement is true of viroids?
a. They are single-stranded RNA particles.
b. They reproduce only outside of the cell.
c. They produce proteins.
d. They affect both plants and animals.
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