Reductive dechlorination is important in the breakdown of chlorinated xenobiotics because
A) anoxic conditions develop rapidly in polluted habitats.
B) oxygen is not present in most soils.
C) aerobic breakdown of xenobiotics is not possible.
D) only cometabolism occurs aerobically.
Answer: A
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The three germ layers are established:
A. once the blastula forms. B. once the inner cell mass of the blastula forms. C. once the blastula implants into the uterine wall. D. once the cells of the inner cell mass reorganize themselves into the gastrula. E. once the gastrula implants into the uterine wall.
If plants consume CO2 during photosynthesis, why hasn't all the atmospheric CO2 been used up? Select all that apply
A. Photosynthesis also produces CO2 as a product. B. Respiration produces CO2 as a product. C. Both photosynthesis and respiration produce CO2 as a product. D. Plants actually don't use CO2 during photosynthesisâ€"they use O2. E. Photosynthesis and respiration use one another's products as reactants.
The most commonly isolated mycobacterium in the United States is:
a. M. tuberculosis. b. M. bovis. c. Mycobacterium avium-intracellulare. d. Mycobacterium paratuberculosis.
Which of the following are organs of the immune system? (Check all that apply.)
_____ red bone marrow _____ spleen _____ thymus _____ thyroid _____ tonsils