Most cases of Salmonella gastroenteritis have a(n)
A. water source.
B. human source.
C. plant source.
D. animal source.
D. animal source.
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Which one of the following viruses has a single-stranded RNA genome that must be turned into a complementary molecule in order to synthesize viral protein?
A. Rotavirus B. Adenovirus C. HIV D. Polio virus E. Influenza virus
Ring-shaped complexes in the centrosome contain ________ in combination with ________.
A) ?-tubulin; cilium B) ?-tubulin; ?-tubulin C) ?-tubulin; tubulin GTP D) ?-tubulin; pericentrin E) ?-tubulin; tubulin GTP
By analogy, the orbitals and atomic nucleus may be
said to most resemble a. a merry-go-round. b. a sundial. c. a multilevel apartment building. d. a nest of mixing bowls. e. ripples in a pond.
Land plants, or embryophytes, evolved from
__________, a kind of green algae. Fill in the blank(s) with the appropriate word(s).