The essential enzyme for the C₄ pathway is A) ribulose bisphosphate carboxylase:oxygenase B) phosphoenolpyruvate carboxylase C) ferredoxin-thioredoxin reductase D) glyoxylate oxygenase

Question

Quizplus · Accepted Answer

The C₄ pathway involves the fixation of carbon dioxide into organic molecules through the activity of phosphoenolpyruvate carboxylase (PEPC), making B the correct choice. A is incorrect because ribulose bisphosphate carboxylase:oxygenase (Rubisco) catalyzes the first step in the Calvin cycle, which is a different pathway. C is incorrect because ferredoxin-thioredoxin reductase is involved in regulating the redox state of the plant cell and does not directly participate in carbon fixation. D is incorrect because glyoxylate oxygenase breaks down glyoxylate, a product of the glyoxylate cycle, which is also a different pathway.

The Essential Enzyme for the C4 Pathway Is

The Essential Enzyme for the C₄ Pathway Is