Chapter 5: Beta

Chapter self-test · answers save on this device

Beta. New questions still under teacher review. Answers and wording may change, and your saved progress may reset when they do.

Part A · Multiple choice

Question 1 of 37 · 0 answered · 0 checked

Question 1 · 5.2

In bright light, a chloroplast has little NADP+ available because the Calvin cycle has slowed. Which change would you expect in the thylakoid membrane?

A.More water splitting and oxygen release, because electrons with nowhere to go are pushed back through photosystem II toward the lumen.B.No proton pumping at all, because the whole chain stops when NADP+ is not available to accept electrons from photosystem I.C.More NADPH, because the extra electrons from photosystem I reduce more NADP+ than before, so the Calvin cycle speeds up.D.More cyclic electron transport, because photosystem I electrons return to plastoquinone, pumping protons and making ATP without NADP+.

Answers save on this device until you retake the test.