In the "photo" reaction of photosynthesis, where does the energy to build ATP come from, exactly?
a. In the water-splitting photosystem, the electrons donated by water are converted directly into energy.
b. In the NADPH-producing photosystem, the electrons from the electron transport chain produce energy upon being transferred.
c. In the first electron transport chain, hydrogen ions are pumped into the thylakoid by high-energy electrons; the kinetic energy from the release of these ions builds ATP.
d. In the water-splitting photosystem, the electrons release energy upon being transferred to the electron transport chain.
e. The energy to build ATP does not come from any one point, exactly.
Answer: c. In the first electron transport chain, hydrogen ions are pumped into the thylakoid by high-energy electrons; the kinetic energy from the release of these ions builds ATP.
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