The propagation cycle that occurs in acid mine drainage is caused by

A) reduction of Fe3+ by sulfuric acid.
B) the oxidation of sulfide to sulfuric acid by microbial oxidation of iron (Fe3+).
C) microbial sulfate reduction.
D) low pH and high oxygen concentrations.


Answer: B

Biology & Microbiology

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1 mole = 1000 millimoles (mmol); 1millimole = 1000 micromoles (µmol). If a solution contains 38231 µmol, what is that amount in mmol?

A. 382.31 mmol. B. 38.231 mmol. C. 3.8231 mmol. D. 3823.1 mmol.

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Methanogenic Archaea are

A. obligate anaerobes that produce methane. B. obligate anaerobes that consume methane. C. obligate aerobes that consume methane. D. obligate aerobes that produce methane.

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Describe the differences between DNA and RNA.

What will be an ideal response?

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The maximum membrane potential that an ion gradient can produce is the

A) action potential. B) membrane potential. C) equilibrium potential. D) threshold potential. E) resting potential.

Biology & Microbiology