How does carbon fixation differ between C3 and C4 plants?
A) C4 plants undergo carbon fixation by carboxylation of a four- carbon substrate oxaloacetate) , while in C3 plants, a three- carbon compound phosphoglycerate) is carboxylated.
B) C3 plants don't undergo photorespiration, but C4 plants do.
C) Both C3 and C4 plants involve carboxylation of ribulose- 1,5- bisphosphate by rubisco; but in C3, the first stable intermediate is 3- phosphoglycerate, and in C4, it is oxaloacetate.
D) Rubisco is the primary enzyme that catalyzes carbon fixation in C3 plants, and phosphoenolpyruvate carboxylase can catalyze carbon fixation in C4 plants.
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