What is the function of photosystem I in noncyclic photosynthesis?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Prepare for the Biology Test on Energy, Enzymes, Cellular Respiration, Photosynthesis, and Metabolic Pathways with flashcards and multiple-choice questions. Gain insights with detailed hints and explanations to excel in your exam.

Multiple Choice

What is the function of photosystem I in noncyclic photosynthesis?

Explanation:
Photosystem I's job in noncyclic photosynthesis is to use light energy to re-energize electrons and transfer them to NADP+, forming NADPH. This NADPH provides the reducing power needed to convert carbon dioxide into sugars in the Calvin cycle. It doesn’t split water (that’s done by Photosystem II), it doesn’t fix CO2 directly (that happens in the Calvin cycle with ATP and NADPH), and it doesn’t pump protons to make ATP directly (ATP comes from the proton gradient built up mainly by the earlier steps and then used by ATP synthase). So reducing NADP+ to NADPH is the key function of Photosystem I here.

Photosystem I's job in noncyclic photosynthesis is to use light energy to re-energize electrons and transfer them to NADP+, forming NADPH. This NADPH provides the reducing power needed to convert carbon dioxide into sugars in the Calvin cycle. It doesn’t split water (that’s done by Photosystem II), it doesn’t fix CO2 directly (that happens in the Calvin cycle with ATP and NADPH), and it doesn’t pump protons to make ATP directly (ATP comes from the proton gradient built up mainly by the earlier steps and then used by ATP synthase). So reducing NADP+ to NADPH is the key function of Photosystem I here.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy