Which of the Following Is True of Microbes and Their

question 50

Multiple Choice

Which of the following is true of microbes and their membranes?

• A) They are relatively permeable to protons.
• B) Protons can leak through directly when the difference in intracellular and extracellular pH is very high.
• C) Membrane-permeant organic acids can prevent the leakage of protons.
• D) They are able to change the pH optima of their enzymes.
• E) Acidophiles use Na⁺/H⁺ antiporters to remove internal protons.

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Definitions:

Conditional Probability

The probability of an event occurring given that another event has already occurred.

Hurdle Rate

The minimum rate of return on a project or investment required by a manager or investor.

Rate of Return

The gain or loss of an investment over a specified period, expressed as a percentage of the investment's cost.

Return on Investment

A performance measure used to evaluate the efficiency or profitability of an investment, calculated as the net profit divided by the initial cost.