Cytochromes and oxygenases require ________ to function; therefore, for cells that use these enzymes in cellular respiration, it must be supplied in a growth medium
a. iron
b. lithium
c. magnesium
d. selenium
Answer: C
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Scientists have demonstrated that the cholera bacteria, Vibrio cholerae, can exist as a rather harmless form or, by phage conversion, can exist as a disease-causing, virulent form. This conversion is caused by
A. the phage entering the cholera bacterium genome and causing the bacterium's cell to lyse. B. the phage introducing a gene into the bacterium's chromosome that codes for the cholera toxin that can cause death in humans. C. the phage altering the cell wall of the cholera bacterium that produces a toxin that can cause death in humans. D. the phage alters the host cell, which permits direct entry of the cholera bacterium into the host cell leading to death in humans.
During which stage of wastewater treatment is the primary effluent aerated to allow for biodegradation by aerobic microbes?
A) Primary treatment B) Secondary treatment C) Disinfection D) Sludge digestion E) Sedimentation
Each of the following is a category into which proteins encoded by oncogenes fit except
A) growth factors. B) signal receptors. C) plasma membrane-associated GTP-binding proteins. D) cell cycle regulators. E) P450 cytochromes.
Radiation treatments to decrease bone pain are.
A) palliative. B) prophylactic. C) curative. D) proliferative.