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26 October, 23:52

Describe the overall changes in matter that occur during the light-independent reactions. What does the plant start with and what does it end with? What is the source of energy that powers this change?

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  1. 27 October, 00:26
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    In the light-independent reactions, the plant starts with carbon dioxide and ends up with glyceraldehyde-3-phosphate (G3P). It uses ATP and NADPH from the light-dependent reactions as energy sources

    Explanation:

    Step 1: CO₂ adds to ribulose biphosphate (RBP) to form a six-carbon sugar that immediately decomposes into two molecules of 3-phosphopglycerate (3-PGA).

    CO₂ + RBP ⟶ 2 3-PGA

    Step 2. A phosphate group adds to the 3-PGA to form 1,3-biphosphoglycerate (1,3-BPG).

    3-PGA + ATP ⟶ 1,3-BPG + ADP

    Step 3. NADPH reduces the 1,3-BPG to G3P

    1,3-BPG + NADPH ⟶ G3P + NADP⁺

    Most of the G3P is regenerated into RBP, but some leaves the cycle to become glucose.
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