IB Biology 7 Views 1 Answers

Sourav PanNovember 9, 2024
What are the products of the light-dependent reactions?
What are the products of the light-dependent reactions?
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Sourav PanMay 15, 2025
The products of the light-dependent reactions of photosynthesis are primarily ATP and NADPH. These molecules are essential for the subsequent light-independent reactions, commonly known as the Calvin Cycle.
- ATP (Adenosine Triphosphate): This molecule serves as an energy carrier. It is produced through a process called photophosphorylation, where light energy is used to add a phosphate group to ADP (adenosine diphosphate) in the thylakoid membranes of chloroplasts.
- NADPH (Nicotinamide Adenine Dinucleotide Phosphate): NADPH acts as a reducing agent and provides the necessary electrons for the reduction of carbon dioxide in the Calvin Cycle. It is generated when NADP+ is reduced by electrons that have been energized by light absorbed by Photosystem I.
Additionally, oxygen (O2O2) is produced as a byproduct during these reactions through the photolysis of water molecules. The overall reaction can be summarized as follows:
12H2O+12NADP++18ADP+18Pi+light energy→6O2+12NADPH+18ATP
In summary, the light-dependent reactions convert solar energy into chemical energy stored in ATP and NADPH, while also releasing oxygen as a waste product.
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