Question

The primary acceptor of carbon dioxide in C${}_3$ plants is a

• A. 2-carbon compound
• B. 5-carbon compound
• C. 3-carbon compound
• D. 6-carbon compound

Answer 1

The correct option is B 5-carbon compound

The primary acceptor of carbon dioxide during light independent reactions of photosynthesis in C${}_3$ plants is RuBP (ribulose-1,5-bisphosphate). It is a 5-carbon compound. RuBP combines with carbon dioxide in presence of RuBisCO to form an unstable 6-carbon compound which splits into two molecules of 3-PGA.