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The Calvin cycle proceed in three stages...

The Calvin cycle proceed in three stages:
1. Reduction, during which carbohydrate is formed at the expense of the Photochemically made ATP and NADPH.
2. Regeneration, during which the carbon dioxide acceptor ribulose-1,5-biphate is formed.
3. Carboxylation, during which the carbon dioxide combines with ribulose-1,5-biphosphate.
Identify the correct sequence.

A

`3rarr1rarr2`

B

`3rarr2rarr1`

C

`1rarr2rarr3`

D

`2rarr1rarr3`

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the correct sequence of stages in the Calvin cycle, we need to understand the three stages mentioned: Carboxylation, Reduction, and Regeneration. Here’s a step-by-step breakdown of the process: ### Step-by-Step Solution: 1. **Identify the Stages of the Calvin Cycle**: - The Calvin cycle consists of three main stages: Carboxylation, Reduction, and Regeneration. 2. **Understand Each Stage**: - **Carboxylation**: This is the first stage where carbon dioxide (CO2) combines with ribulose-1,5-bisphosphate (RuBP) to form 3-phosphoglycerate (3-PGA). - **Reduction**: In this second stage, ATP and NADPH (produced during the light reactions of photosynthesis) are used to convert 3-PGA into glyceraldehyde-3-phosphate (G3P). - **Regeneration**: The final stage involves the conversion of G3P back into RuBP, allowing the cycle to continue. 3. **Determine the Correct Sequence**: - Based on the definitions and order of the stages: - First is **Carboxylation** (combination of CO2 with RuBP). - Second is **Reduction** (conversion of 3-PGA to G3P). - Third is **Regeneration** (conversion of G3P back to RuBP). - Therefore, the correct sequence is: **Carboxylation (1st), Reduction (2nd), Regeneration (3rd)**. 4. **Final Answer**: - The correct sequence of the Calvin cycle stages is: **3 (Carboxylation), 1 (Reduction), 2 (Regeneration)**.
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