Question:
Which one of the following steps is not a part of the Calvin cycle?
Which one of the following steps is not a part of the Calvin cycle?
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Calvin cycle phases:
1. Carboxylation (CO2 fixation).
2. Reduction (using ATP and NADPH).
3. Regeneration (of RuBP).
1. Carboxylation (CO2 fixation).
2. Reduction (using ATP and NADPH).
3. Regeneration (of RuBP).
Updated On: Sep 1, 2026
- Carboxylation
- Regeneration
- Protonation
- Reduction
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Question:
This question tests knowledge of the Calvin cycle phases.
Step 2: Detailed Explanation:
The Calvin cycle consists of three phases:
1. Carboxylation (A): CO2 fixation by Rubisco to form 3-phosphoglycerate.
2. Reduction (D): Conversion of 3-PGA to G3P using ATP and NADPH.
3. Regeneration (B): Regeneration of RuBP from G3P.
Protonation (C):
- This is not a step in the Calvin cycle.
- Protonation refers to the addition of a proton (H+), which is not a named phase.
Thus, protonation is not part of the Calvin cycle.
Step 3: Final Answer:
Thus, protonation is not a part of the Calvin cycle, which corresponds to option (C).
[0.5cm]
This question tests knowledge of the Calvin cycle phases.
Step 2: Detailed Explanation:
The Calvin cycle consists of three phases:
1. Carboxylation (A): CO2 fixation by Rubisco to form 3-phosphoglycerate.
2. Reduction (D): Conversion of 3-PGA to G3P using ATP and NADPH.
3. Regeneration (B): Regeneration of RuBP from G3P.
Protonation (C):
- This is not a step in the Calvin cycle.
- Protonation refers to the addition of a proton (H+), which is not a named phase.
Thus, protonation is not part of the Calvin cycle.
Step 3: Final Answer:
Thus, protonation is not a part of the Calvin cycle, which corresponds to option (C).
[0.5cm]
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