Under natural conditions, the amount of nitrogen gas returned to the atmosphere by denitrification approximately equals
A) phosphorus cycling.
B) evaporation.
C) nitrogen fixation.
D) sublimation.
E) photosynthesis.
C
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Glycolysis is a series of chemical reactions (endergonic and exergonic) by which the cell can obtain ATP. NAD+ plays a crucial role in the reactions of glycolysis by:
A. accepting electrons from glucose so that glucose gets partially oxidized to pyruvate. B. donating electrons to pyruvate when glucose gets partially oxidized. C. converting endergonic reactions to exergonic reactions so that there is an output of energy to make ATP. D. donating electrons to ADP to make ATP.
Repeated sequences within eukaryotic genomes may be represented as long repeated sequences next to each other, and are called ___________ repeats
Repeated sequences in eukaryotic genomes can also be located throughout the genome, and are called _______________ repeats. A. tandem; dispersed B. dispersed; tandem C. overlapping; adjacent D. adjacent; overlapping E. None of the answer options is correct.
In which trophic level is biological magnification most likely to have a deleterious impact?
1.primary producer 2.primary consumer 3.secondary consumer 4.tertiary consumer
Atoms of a single element that possess different numbers of neutrons are called:
A. ions. B. isotopes. C. polymers. D. monomers. E. isomers.