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Which enzyme is used in converting bicarbonate ion to oxaloacetate?

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Which enzyme is used in converting bicarbonate ion to oxaloacetate?

(a) Phosphoenolpyruvate reductase

(b) Phosphoenolpyruvate hydrogenase

(c) Phosphoenolpyruvate carboxylase

(d) Phosphoenolpyruvate dehydrogenase

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I would like to ask this question from Chloroplast Function topic in division Chloroplast Structure and Function of Cell Biology

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The correct answer is (c) Phosphoenolpyruvate carboxylase

For explanation: The phosphoenolpyruvate carboxylase enzyme is used to catalyze bicarbonate to oxaloacetate and phosphate. This is one of the important mechanism in the carbon fixation in CAM plants.

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