Multiple choice

The enzyme PEP caboxylase has an advantage over RUBISCO in the fact that

  1. it is present in both mesophyll and bundle sheath cells

  2. it does not promote photorespiration

  3. it requires high concentration of CO2

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

PEP carboxylase has no oxygenase activity, so it does not catalyze photorespiration. Unlike RUBISCO, it exclusively fixes CO2 even in high O2 conditions, making C4 photosynthesis more efficient.

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