Why are viral genomes typically smaller than bacterial genomes?
a. Viral particle size limits genome size.
b. Viruses must replicate quickly.
c. RNA is unstable.
d. A and B.
e. A, B, and C.
E
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The movement of sucrose and H+ into the cell by a common membrane protein reflects transport through a
A. voltage-gated channel. B. mechanosensitive channel. C. uniporter. D. symporter. E. antiporter.
Four of the five viruses listed below are enveloped in
membrane from the host cell. Select the exception. a. adenoviruses b. influenzaviruses c. herpesviruses d. smallpox virus e. virus that causes AIDS
Analysis of a certain polymer shows that it contains phosphate groups, ribose groups, and pyrimidines. Based on this
information, what statement best describes this compound? a. It is RNA. b. It is DNA. c. It is cylic AMP. d. It is a polypeptide. e. It is an inorganic compound.
The sickle-cell allele produces a serious blood disease in homozygotes. Why doesn't natural selection eliminate this allele from all human populations?
A) Natural selection is a positive force, so it does not eliminate alleles. B) In populations where endemic malaria is present, heterozygotes have an important advantage: They are resistant to malaria and therefore are more likely to survive and produce offspring that carry the allele. C) Mutations keep bringing the allele back into circulation. D) Natural selection occurs very slowly, but elimination of the sickle-cell allele is expected to occur soon.