Where does the light reactions occur? (Choose ONE correct answers)

Question

BlackTom AI · Accepted Answer

To approach this question, let's map where the light-dependent reactions actually take place within the chloroplasts.
Option 1: 'Chloroplast, in the stroma' — The stroma is the fluid surrounding the thylakoids and is the site of the Calvin cycle, not the light-dependent reactions. This makes the statement incorrect.
Option 2: 'Chloroplast, in the lumen' — The lumen is the interior space of the thylakoid; while it plays a role in proton gradient, the light reactions themselves are not carried out there as a membrane-intrinsic process. Therefore, this is not accurate for the location of the light reactions.
Option 3: 'Chloroplast, in the thylakoid membrane' — This is correct. The light reactions occur in the thylakoid membranes where photosystems I and II, electron transport chain, and ATP synthase reside and drive the production of ATP and NADPH.
Option 4: 'Chloroplast, in the thylakoid space' — The thylakoid space refers to the lumen inside the thylakoids, which is distinct from the membrane itself. While the proton gradient is established across the membrane and involves the lumen, the actual light-dependent reactions are not said to occur inside the lumen; they occur across the membrane. Hence, this choice is incorrect.

Where does the light reactions occur? (Choose ONE correct answers)

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Where does the light reactions occur? (Choose ONE correct answers)

View Explanation

Log in for full answers

Similar Questions

Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?

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