A) PGA
B) RuBP
C) Oxaloacetate
D) Pyruvic acid
Correct Answer: A
Solution :
The \[\text{C}{{\text{O}}_{\text{2}}}\]acceptor in Calvin cycle (\[{{\text{C}}_{\text{3}}}\]cycle) is ribulose 1-5 biphosphate. Six molecules of\[\text{C}{{\text{O}}_{\text{2}}}\]combine with six molecules of RuBP to form twelve molecules of 3-phosphoglyceric acid (3PGA) which is the first stable product of \[{{\text{C}}_{3}}\] cycle. This reaction is catalysed by ribulose biphosphate carboxylase (Rubisco). In \[{{\text{C}}_{\text{4}}}\] cycle (Hatch-Slack cycle) phosphoenol pyruvic acid is the first \[\text{C}{{\text{O}}_{\text{2}}}\]cceptor which form oxaloacetic acid (The first product of\[{{C}_{4}}\]cycle).
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