In the C₄ Pathway, the Enzyme PEP Carboxylase

question 19

Multiple Choice

In the C₄ pathway, the enzyme PEP carboxylase:

• A)uses O₂ as a substrate.
• B)uses CO₂ as a substrate.
• C)operates inefficiently when the CO₂ concentration is low.
• D)is active only in the chloroplasts of mesophyll cells.
• E)catalyzes the formation of oxaloacetate.

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