Answer :
Carbon fixation involves the addition of carbon dioxide to RuBP (Ribulose-1,5-bisphosphate), the correct option is 4.
During the process of photosynthesis, carbon fixation is the initial step in the Calvin cycle, which occurs in the stroma of chloroplasts. The enzyme responsible for carbon fixation is called Rubisco (Ribulose-1,5-bisphosphate carboxylase/oxygenase).
Rubisco catalyzes the addition of carbon dioxide to RuBP, forming an unstable six-carbon compound that quickly breaks down into two molecules of 3-PGA (3-phosphoglycerate) RuBP is a crucial molecule in the process of carbon fixation as it serves as the acceptor of carbon dioxide and initiates the conversion of inorganic carbon into organic compounds during photosynthesis, the correct option is 4.
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The correct question is:
Carbon fixation involves the addition of carbon dioxide to _____.
- Rubisco
- NADPH
- G3P
- RuBP
- 3-PGA
Final answer:
Carbon fixation refers to the process wherein carbon dioxide is added to a compound called Ribulose-1,5-bisphosphate (RuBP), facilitated by the enzyme Rubisco. The resultant product is a six-carbon intermediate which eventually splits into two molecules of 3-PGA.
Explanation:
Carbon fixation is the process of converting inorganic carbon dioxide into organic compounds. In photosynthetic organisms, this process involves the addition of carbon dioxide to a compound known as Ribulose-1,5-bisphosphate (RuBP). This reaction is facilitated by the enzyme Rubisco. The product of this reaction is a six-carbon intermediate which quickly splits into two molecules of 3-phosphoglycerate (3-PGA). Therefore, the correct answer to the question is RuBP, since carbon dioxide is added to RuBP during carbon fixation.
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