Which of the following events are associated with chemiosmosis in chloroplasts?
A) The pH of the stroma increases and ATP is synthesized.
B) The pH of the thylakoid space increases and ATP is synthesized.
C) The pH of the cytoplasm outside the chloroplast decreases and ATP is synthesized.
D) The pH of the stroma decreases and ATP is hydrolyzed.

Question

Quizplus · Accepted Answer

Chemiosmosis in chloroplasts involves ATP synthesis through the proton gradient established across the thylakoid membrane. This involves the movement of protons into the thylakoid space, resulting in a decrease in pH, which drives the synthesis of ATP via ATP synthase. Therefore, option B is the correct choice. Option A is incorrect, as the pH of the stroma does not increase during chemiosmosis. Option C is also incorrect, as there is no direct connection between ATP synthesis in chloroplasts and the pH of the cytoplasm outside the chloroplast. Option D is incorrect because ATP hydrolysis does not occur in chloroplasts during chemiosmosis.

Which of the Following Events Are Associated with Chemiosmosis in Chloroplasts