Which of the following statements concerning viruses is true?
a. Viruses possess enzymes for protein synthesis and ATP generation.
b. Viruses contain both DNA and RNA, and they undergo binary fusion.
c. Viruses are usually about the same size as bacteria.
d. The "host range" for a virus is determined by the presence or absence of particular components on the surface of a host cell that are required for the virus to attach.
Answer: d. The "host range" for a virus is determined by the presence or absence of particular components on the surface of a host cell that are required for the virus to attach.
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The structure labeled “B” in the figure is a(n)
a. asexual spore. b. haploid spore. c. zygospore. d. gamete. e. spore sac.
Four of the five choices listed below are parts of a
seed. Select the exception. a. ovary b. cotyledon c. embryo d. coat e. endosperm
Most elements of the endomembrane system are connected by:
A) cytoskeleton B) vesicular trafficking C) continuous membranes
The Xer site-specific recombination system
a. is needed to allow segregation of nonrecombined daughter chromosomes. b. is inactive during the process of bacterial cell division. c. generates a single dimeric molecule. d. is needed to resolve the product of a general recombination between copies of the bacterial chromosome. e. is required to correct mutations generated during DNA replication.