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How do the light reactions produce ATP? Select one: a. Potential energy stored in a hydrogen...

How do the light reactions produce ATP?

Select one:

a. Potential energy stored in a hydrogen ion (H+) gradient is used to synthesize ATP.

b. Photosystem I directly adds a phosphate to ADP.

c. Photosystem II directly adds a phosphate to ADP.

d. Energy released by electrons is directly used to synthesize ATP.

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Answer #1

The correct answer is option A that is potential energy is stored in a hydrogen ion gradient and is then used to synthesize ATP. Light is absorbed and that absorbed energy is used to drive electrons from water to generate NADPH and drive protons across the membrane. These protons pass through ATP synthase and produce ATP.

B, C And D are wrong options because PS I and II do not put directly phosphate to the ADP and energy of electrons is not directly used to synthesize ATP.

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