A wide variety of microorganisms are commercially used to manufacture ________ for human consumption.

A. vitamins
B. fatty acids
C. sugars
D. None of the choices are correct.


Answer: A

Biology & Microbiology

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The ____ are most sensitive to changes in CO2

a. aortic bodies b. carotid bodies c. receptors of the medulla d. receptors of the aorta e. medulla bodies

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Pepsin, a digestive enzyme that degrades proteins in the stomach, is synthesized as pepsinogen and

converted to active pepsin in the stomach by the removal of several amino acids. The activation of pepsin is an example of

a. transcriptional regulation. b. translational regulation. c. posttranscriptional regulation. d. posttranslational regulation. e. RNA interference.

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In humans, the fluid immediately surrounding the embryo is contained in the _____

a. allantois b. placenta c. chorion d. amnion e. yolk sac

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Chemical evolution started on Earth

a. after the appearance of prokaryotic cells. b. long before any cells emerged. c. after the appearance of eukaryotic cells. d. after the appearance of eukaryotic cells but before the appearance of multicellular organisms. e. after the appearance of multicellular organisms.

Biology & Microbiology