Potable refers to water
a. resulting from washing, bathing, and cooking.
b. that has been filtered to decrease turbidity.
c. that is untreated.
d. that is safe for human consumption.
Answer: D
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Each DNA nucleotide is composed of ____
a. a six-carbon sugar, a phosphate group, and one of twenty amino acids b. a five-carbon sugar, a nitrogenous base, and one of twenty amino acids c. a five-carbon sugar, a phosphate group, and one of four nitrogenous bases d. a six-carbon sugar, a nitrogenous base, and one of four amino acids e. a five-carbon sugar, a phosphate group, and one of four amino acids
Species of Rhizobium and Bradyrhizobium bacteria are most directly associated with ____
a. nitrification b. ammonification c. nitrogen cycling d. nitrogen fixation e. nitrogen assimilation
In most eumetazoans the innermost tissue layer during development is the
a. mesoderm. b. epiderm. c. mesoglea. d. endoderm. e. ectoderm.
When potassium ions are transported into guard cells, water
A) leaves the guard cells by osmosis. B) is actively transported out of the guard cells. C) enters the guard cells by osmosis. D) is actively transported into the guard cells. E) moves to the edge of the guard cell.