All of the following tend to hold nutrients in estuaries for use by other organisms except:
a. adsorption onto silt particles.
b. reduced numbers of filter feeders.
c. the formation of pseudofeces.
d. overturn.
B
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When potassium ion channels open, which of
the following occurs?
a. potassium ions flow into the axon cytoplasm b. the axon cytoplasm becomes more positively charged c. sodium ions diffuse into the axon cytoplasm d. all of these occur e. none of these occur
Several amphibian species survive the winter using antifreeze chemicals by the process of
A) supercooling. B) countercurrent heat exchange. C) torpor. D) rete.
The cyanobacterium Trichodesmium ________.
A. fixes a significant amount of N2 in oceanic environments B. is a spherical organism C. uses nitrite as a source of nitrogen D. fixes N2 during the day
Activated carriers are small molecules that can diffuse rapidly and be used to drive biosynthetic reactions in the cell. Their energy is stored in a readily transferable form such as high-energy electrons or chemical groups
Which of the molecules below is the most widely used activated carrier? (a) FADH2 (b) NADH (c) NADPH (d) ATP