The pH of the inner thylakoid space has been measured,as have the pH of the stroma and of the cytosol of a particular plant cell.Which of the following relationships would you expect to find when the cell is examined in the light?

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Quizplus · Accepted Answer

The pH within the thylakoid space is expected to be lower than that of the stroma because the thylakoid membrane is where the light-dependent reactions of photosynthesis occur, leading to proton accumulation within the thylakoid space. This creates a proton gradient that is used to generate ATP and NADPH. In contrast, the stroma is where the light-independent reactions of photosynthesis occur, and it is where CO2 is fixed into organic molecules via the Calvin cycle. Therefore, the pH of the stroma is not expected to be as low as that of the thylakoid space. The cytosol has a relatively neutral pH and is not directly involved in photosynthesis, so its pH is not relevant in this context.

The PH of the Inner Thylakoid Space Has Been Measured,as