In addition to driving the synthesis of ATP and the reduction of NADP⁺ to NADPH, light stimulates the Calvin cycle by _______ and _______.

Question

Quizplus · Accepted Answer

Light stimulates the influx of protons into the thylakoid lumen, creating a proton gradient that powers ATP synthesis. As protons flow out of the lumen and into the stroma through ATP synthase, they increase the pH of the stroma, which stimulates the Calvin cycle. Additionally, light activates the enzyme rubisco, which catalyzes the first step of the Calvin cycle, by reducing some of its active sites. This enhances the enzyme's ability to bind to carbon dioxide and begin the cycle. Therefore, B, increasing the pH of the stroma and reducing some Calvin cycle enzymes, is the best choice.

In Addition to Driving the Synthesis of ATP and the Reduction