What substances will release hydrogen ions when their concentration is low and accept them when
their concentration is high?
a. salts
b. acids
c. bases
d. buffers
e. alkalines
D
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In addition to several other factors, the overall risks of environmental chemicals depend on genetically determined variations in the ____ involved in transport, metabolism, and excretion of these chemicals
a. proteins b. body's oxygen levels c. body's pH d. ribosomes e. disaccharides
Escherichia coli has not been found to be pathogenic in humans.
Answer the following statement true (T) or false (F)
The basic unit of a DNA molecule is the
A. nitrogenous base. B. sugar-phosphate backbone. C. amino acid. D. nucleotide. E. ribose sugar.
Which one of the following would not be found in an mRNA molecule?
a. the promoter b. the protein coding region c. the 3' untranslated region d. the translation start and stop codons