Chapter 21: Q. 25 (page 533)
Why can’t dogs catch the measles?
Short Answer
Measles is a DNA virus, and DNA viruses are the source of many human diseases. Glycoproteins are not found in dogs. The virus is unable to attach to the cells of dogs.
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Chapter 21: Q. 25 (page 533)
Why can’t dogs catch the measles?
Measles is a DNA virus, and DNA viruses are the source of many human diseases. Glycoproteins are not found in dogs. The virus is unable to attach to the cells of dogs.
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How are viroids like viruses?
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.
The viral ________ play(s) a role in attaching a virion to the host cell.
a. core
b. capsid
c. envelope
d. both b and c
Figure 21.10 Which of the following statements is false?
a. In the lytic cycle, new phages are produced and released into the environment.
b. In the lysogenic cycle, phage DNA is incorporated into the host genome.
c. An environmental stressor can cause the phage to initiate the lysogenic cycle.
d. Cell lysis only occurs in the lytic cycle.
Which statement is not true of viral replication?
a. A lysogenic cycle kills the host cell.
b. There are six basic steps in the viral replication cycle.
c. Viral replication does not affect host cell function.
d. Newly released virions can infect adjacent cells.
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