Question

The enzyme which catalyses photosynthesis C4 cycle. RUBP carboxylase or PEP carboxylase

Answer 1

The answer is PEP carboxylase.

C4 ("four-carbon") plants initially attach CO 2 to PEP (phosphoenolpyruvate) to form the four-carbon compound OAA (oxaloacetate) using the enzyme PEP carboxylase.

These plants, called C4 plants and CAM plants, initially bind carbon dioxide using a much more efficient enzyme. This allows a more efficient harvest of CO 2 , allowing the plant to trap sufficient CO 2 without opening its stomates too often. Each then uses the CO 2 in the Calvin-Benson cycle.