Air and water pollution result mainly from
A. improper waste disposal.
B. agricultural chemicals.
C. increased industrialization.
D. All of these are correct.
Answer: D
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Which of the following does not contribute significantly to DNA damage?
A. deamination due to hydrolysis B. alkylation of bases C. deamination due to superoxide radicals D. oxidation by hydroxyl radicals E. oxidation by hydrogen peroxide (H2O2)
Outline the four characteristics of cancer. What will be an ideal response?
Approximately ____ percent of the sun’s energy is reflected back into space
a. 10 b. 20 c. 30 d. 40 e. 50
Oxygen gas produced during photosynthesis orginates as
a) oxygen atoms contained in carbon dioxide are released when the carbon is fixed b) oxygen atoms are released by the metabolism of carbohydrates c) a molecule of chlorophyll oxidized by a photon d) oxygen atoms contained in water molecules e) a byproduct of nitrogen-fixing bacteria