Chlorofluorocarbons (CFCs) are pollutants because ____
a. they do not break down easily
b. they combine with water to form hydrochloric and hydrofluoric acids
c. they are found in smog
d. they are photochemical oxidants
e. they combine with carbon dioxide to form acid rain
ANSWER: a
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A molecular clock is based on
a. measurement of daylength by pigment complexes. b. daily changes in amino acid sequence in specialized proteins. c. regulation of the order in which genes are turned on. d. precise oscillations of atoms in a crystal. e. a constant rate of mutation in DNA sequences.
Which of the following is an example of bioremediation?
a. The culturing of milk products, like yogurt b. The emergence of antibiotic-resistant MRSA c. The removal of petroleum products in an oil spill d. The development of antibiotics to fight pathogenic prokaryotes such as Yersenia pestis
One generalization of the cell theory is that
a. all cells have a nucleus. b. all cells have cell walls. c. the cell is the smallest unit that displays the properties of life. d. cells can arise from nonliving matter. e. all cells are microscopic
The first amino acid of a new polypeptide
chain is a. alanine. b. cysteine. c. variable. d. phenylalanine. e. methionine