What role(s) do ATP and NADPH from the light-dependent reactions play in the conversion of PGA to PGAL in the Calvin-Benson cycle?
A)ATP donates a phosphate group and NADPH donates electrons and hydrogen.
B)ATP and NADPH both donate phosphate groups.
C)ATP provides electrons and NADPH provides a phosphate group.
D)ATP provides a carbon source and NADPH donates electrons and hydrogen.
E)ATP donates a phosphate group and NADPH provides a carbon source.

Question

Quizplus · Accepted Answer

ATP donates a phosphate group to PGA during the phosphorylation step of the Calvin-Benson cycle, converting PGA to an unstable intermediate called 1,3-bisphosphoglycerate. NADPH donates electrons and hydrogen to reduce 1,3-bisphosphoglycerate to PGAL during the reduction step of the cycle. This is how ATP and NADPH produced in the light-dependent reactions are utilized in the Calvin-Benson cycle to produce PGAL, the precursor to glucose and other organic molecules.

What Role(s) Do ATP and NADPH from the Light-Dependent Reactions