QQuestionAnatomy and Physiology
QuestionAnatomy and Physiology
Carbon fixation involves the addition of carbon dioxide to _____.
A. Rubisco
B. NADPH
C. G^3P
D. RuBP
E. 3 -PGA
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Answer
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Step 1:I'll solve this problem step by step, focusing on the process of carbon fixation in photosynthesis.
Step 2:: Understand Carbon Fixation
This process converts inorganic carbon dioxide ($$CO_{2}$$) into organic compounds.
Carbon fixation is the first major step of the Calvin cycle (light-independent reactions) in photosynthesis.
Step 3:: Identify the Key Enzyme
The enzyme responsible for carbon fixation is Rubisco (Ribulose- 1,5 -bisphosphate carboxylase/oxygenase). Rubisco catalyzes the first major carbon-fixing reaction in the Calvin cycle.
Step 4:: Recognize the Substrate
Rubisco adds $$CO_{2}$$ to a 5-carbon sugar called ribulose bisphosphate (RuBP).
This is the critical step of carbon fixation.
Step 5:: Analyze the Reaction
When $$CO_{2}$$ is added to RuBP, it creates an unstable 6-carbon intermediate that immediately splits into two molecules of 3-phosphoglyceric acid (3-PGA).
Step 6:: Evaluate the Answer Choices
Reviewing the options, we can see that RuBP (Option D) is the substrate to which $$CO_{2}$$ is added during carbon fixation.
Final Answer
RuBP (Ribulose bisphosphate)
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