Researchers discovered that carbon fixation in spinach leaves utilizes 45,000 molecules of ATP and 30,000 molecules of NADPH in an hour. The deficit in ATP required for carbon fixation is most directly made up for by which of the following processes?
A) substrate level phosphorylation
B) mitochondrial electron flow
C) cyclic electron flow
D) linear electron flow

Question

Quizplus · Accepted Answer

Cyclic electron flow in photosynthesis is specifically involved in producing additional ATP without producing NADPH, thus helping to balance the ATP/NADPH ratio required for the Calvin cycle and carbon fixation in plants like spinach.

Researchers Discovered That Carbon Fixation in Spinach Leaves Utilizes 45,000