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The interior of a lysosome is kept acidic by

  • A.proton pumps in its membrane
  • B.the enzymes it contains breaking down acid
  • C.carbon dioxide diffusing inward
  • D.the absence of any water inside it

Answer: A

An ATP-driven pump moves hydrogen ions in, holding the lumen around pH 5 against the near-neutral cytosol. Maintaining that difference costs the cell energy continuously. A lysosome whose pump fails loses its acidity and with it most of its digestive power.

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