Question

Choose the correct answer from the alternatives given.
The enzyme which catalyzes the photosynthesis in $C_4$ cycle is

• A. PEP carboxylase
• B. RuBP carboxylase
• C. carbonic anhydrase
• D. hexokinase

Answer 1

The correct option is B RuBP carboxylase

CO${}_2$ is incorporated into a five-carbon sugar named ribulose bisphosphate (RuBP) to form a six-carbon intermediate which immediately splits in half to form two molecules of 3-phosphoglycerate. The enzyme which catalyzes this first step is RuBP carboxylase or rubisco.

Hence the correct answer is 'RuBP carboxylase.'