Gallionella bacteria can get energy from the reaction Fe2+ ? Fe3+. This reaction is an example of
A) oxidation.
B) reduction.
C) fermentation.
D) photophosphorylation.
E) the Calvin-Benson cycle.
A
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The allergic response is primarily mediated by _____ antibodies.
A. IgG B. IgM C. IgA D. IgE E. IgD
Why are new flu shots necessary every year?
A) The antiviral chemicals in flu shots last only 11 months. B) Flu shots do not result in the production of memory cells. C) Depending on the year, either bacteria or viruses cause the flu. D) Flu viruses have a high mutation rate.
The relatively shallow part of the ocean extending from the low tide mark to the edge of the continental shelf is called the
A. littoral zone. B. limnetic zone. C. neritic zone. D. surface zone. E. abyssal zone.
CO2 makes up about ________ percent of the atmosphere
A) 0.035 B) 35 C) 3.5 D) 37 E) 0.35