Question

In the given representation of C3 cycle, identify A, B and C and select the correct option

• A. A-3PGA, B-RUBP, C-Pyruvic acid
• B. A-RUBP, B-3PGA, C-Regeneration
• C. A-PEP, B-OAA, C-Malic acid
• D. A-PEP, B-RUBP, C-OAA

Hint:

Remember the sequence: CO{2} + RUBP → 3PGA → G3P → Regeneration of RUBP. RUBP regeneration is essential to keep the cycle continuous.

Answer 1

The Correct Option is B

In the C3 (Calvin) cycle, RUBP (ribulose-1,5-bisphosphate) is the CO\textsubscript{2} acceptor (A). CO\textsubscript{2} fixation by Rubisco produces 3-phosphoglycerate (3PGA) (B). The cycle includes regeneration of RUBP (C) to allow continuous CO\textsubscript{2} assimilation. Hence, A-RUBP, B-3PGA, C-Regeneration is correct.