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How Does Carbon Fixation Differ Between C3 and C4 plants

Question 22

Multiple Choice

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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