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.

Question

Quizplus · Accepted Answer

Microbes and their membranes are not permeable to protons. However, when the difference in intracellular and extracellular pH is high, protons can leak through the membrane directly. This can cause a decrease in intracellular pH, which can be harmful to the microbe.

Which of the Following Is True of Microbes and Their