Smallpox is an enveloped virus with a DNA genome. We have eliminated this once deadly virus through an aggressive worldwide vaccination program. Why might a vaccine be successful with smallpox, but not with HIV?
A. DNA genomes mutate less rapidly than RNA genomes.
B. Host cells have RNA in them, and thus do not raise antibodies against RNA.
C. RNA is more stable than DNA, and is less likely to be destroyed by the vaccine.
D. Viruses with DNA genomes must replicate inside a host cell.
E. Smallpox is an enveloped virus.
A. DNA genomes mutate less rapidly than RNA genomes.
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Staphylococcus aureus is a common foodborne disease, because it
A) grows on common foods. B) is present in some humans that work in food processing. C) produces several heat-stable enterotoxins. D) grows on many foods, is present in some humans that work in food processing, and produces several heat-stable enterotoxins.
Which of the following is true about the fetal stage of development?
A) The organ systems initially form, and then grow. B) The head is disproportionately small at the beginning of the stage. C) It comes after the embryonic period. D) It consists of the first three months of the pregnancy.
Rubulavirus falls under which group of the ICTV nomenclature system?
A. Subfamily B. Family C. Genus D. Order
In radishes, red and white are the pure-breeding
colors, and long and round are the pure-breeding shapes, while the hybrids are purple and oval. The cross of a white oval and a purple oval will produce more a. red long than white long. b. purple round than white long. c. purple oval than purple long. d. purple long than purple round. e. purple round than white oval.