Listeria monocytogenes propels itself through mammalian host cells using
A. a modified form of gliding motility.
B. fimbriae-based twitching motility.
C. periplasmic flagella.
D. host cell actin and other cytoskeletal proteins.
Answer: D
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Great swamp forests covered the globe and formed the major coal deposits during the:a
Jurassic period. b. Eocene epoch. c. Carboniferous period. d. Precambrian. e. Ordovician period.
What type of selection is represented by the accompanying figure?
a. no selection b. natural selection c. disruptive selection d. stabilizing selection e. directional selection
Most of the atmospheric oxygen occurs as a result of photosynthesis. From which of the following molecules is the oxygen derived?
A. NADH B. glucose C. carbon dioxide D. chlorophyll E. water
The cause of tetanus is
A) Campylobacter. B) Escherichia coli. C) Clostridium tetani. D) Borrelia burgdorferi. E) Streptococcus pneumoniae.