John G. Swallow and his colleagues used ____ techniques to demonstrate that the observed differences in activity
levels of house mice have a genetic basis.
a. artificial selection
b. sexual selection
c. random mating
d. gel electrophoresis
e. DNA sequencing
ANSWER: a
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How many heme groups does each hemoglobin molecule contain?
a. one b. two c. four d. eight
In most eumetazoans the middle tissue layer during development is the
a. mesoderm. b. epiderm. c. mesoglea. d. endoderm. e. ectoderm.
What do free radicals do?
a. Improve the efficiency of aerobic respiration. b. Act as coenzymes in glycolysis. c. Damage biological molecules. d. Remove metals that combine with oxygen gas. e. Enhance enzyme activity.
The source of cyanide as a chemical pollutant is ________
A) wood preservative B) petroleum products C) pulp and paper bleaching D) mining processes E) plastic manufacturing