NEET Biology question
Identify the correct combination(s) of substrate, enzyme and product from the following.
I. Phosphoenolpyruvate (PEP) — PEP carboxylase — C4 acid (Oxaloacetic acid) II. Malate (C4 acid) — Malic enzyme — C3 acid (Pyruvate) + CO2 III. RuBP — Ribulose-5-phosphate kinase — C3 acid IV. Pyruvate — Pyruvate phosphate dikinase — C4 acid
Answer: (B)
Solution
In mesophyll cells of C4 plants, PEP carboxylase carboxylates 3-carbon PEP to yield the 4-carbon oxaloacetic acid (I is correct). In bundle-sheath cells, malic enzyme oxidatively decarboxylates 4-carbon malate to release CO2 and 3-carbon pyruvate (II is
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