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ATPase

  • A.synthesizes ATP, coupled to transfer of extracellular protons into the cell
  • B.extrudes protons from the cell coupled to the hydrolysis of ATP to ADP
  • C.is the enzyme that incorporates ATP into messenger RNA
  • D.carries out each of the reactions indicated in (a) and (b)

Answer: D

Correct answer: carries out each of the reactions indicated in (a) and (b)

ATPase is reversible, and which way it runs depends on the proton gradient. When the gradient is strong, protons flow inwards through it and the energy is used to make ATP. When the gradient is weak, the enzyme hydrolyses ATP and pumps protons out to restore it - which is how a fermenting cell maintains its membrane potential.

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