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Question
CO2 acceptor during the dark reaction of C3 photosynthesis is
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Solution
The correct option is A RUBP.
The carbon-fixing reaction of photosynthesis involves a cyclic series of reactions, often called as the Calvin cycle or C3 pathway. In carboxylation or fixation, three molecules of CO2 combine with three molecules of 5C compound called ribulose-1, 5- bisphosphate (RuBP), which is the acceptor molecule of CO2, giving rise to an unstable 6- carbon compound. Carboxylation of a molecule of CO2 to RuBP is catalyzed by the enzyme RuBP carboxylase or Rubisco. The resulting 6C compound is highly unstable. This molecule quickly breaks down to give two molecules of 3-phosphoglycerate (3PG), also called phosphoglyceric acid (PGA).
The carbon-fixing reaction of photosynthesis involves a cyclic series of reactions, often called as the Calvin cycle or C3 pathway. In carboxylation or fixation, three molecules of CO2 combine with three molecules of 5C compound called ribulose-1, 5- bisphosphate (RuBP), which is the acceptor molecule of CO2, giving rise to an unstable 6- carbon compound. Carboxylation of a molecule of CO2 to RuBP is catalyzed by the enzyme RuBP carboxylase or Rubisco. The resulting 6C compound is highly unstable. This molecule quickly breaks down to give two molecules of 3-phosphoglycerate (3PG), also called phosphoglyceric acid (PGA).
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