A human karyotype showing 22 pairs of autosomes and two X chromosomes would be
a. a normal male.
b. a normal female.
c. an abnormal male.
d. an abnormal female.
e. a human whose sex cannot be determined.
b
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A group of protozoa that are not motile are the ________.
A. Plasmodium sp. B. trophozoites C. amoebas D. ciliates E. dimorphics
The largest reservoir of water is
a. oceans. b. polar ice and glaciers. c. groundwater. d. lakes and rivers. e. atmosphere.
When legumes with nitrogen-fixation nodules are given chemical fertilizers with high nitrogen concentrations, they abandon support of the nodules and end the symbiosis. Why?
A. The mineral nutrients inhibit nitrogenase activity. B. The plant can conserve valuable energy sources by terminating the symbiotic relationship. C. Nitrogen gas is no longer available in the soil. D. The dissolved chemical nutrients are toxic to Rhizobium bacteria. E. Dissolved nitrogen uncurls the root hairs, releasing the nodule.
When an exergonic reaction is used to fuel an endergonic reaction, the reactions are referred to as being
a. oppositional. b. complimentary. c. coupled. d. paired.