During the light reactions of photosynthesis, ATP is produced when hydrogen ions move a. down a...

Question:

During the light reactions of photosynthesis, ATP is produced when hydrogen ions move

a. down a concentration gradient from the thylakoid space to the stroma.

b. against a concentration gradient from the thylakoid space to the stroma.

c. down a concentration gradient from the stroma to the thylakoid space.

d. against a concentration gradient from the stroma to the thylakoid space.

Light-dependent Reactions

The light-dependent reactions of photosynthesis make use of light energy coming from the sun. These reactions occur in photosystems located in the membranes of the thylakoids. Photosystems are composed of proteins and pigments and the two types include photosystem I and photosystem II. These photosystems help use light energy to produce ATP and NADPH.

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The correct answer is C.

During the light reactions of photosynthesis, ATP is produced when hydrogen ions move down a concentration gradient from the...

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