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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Abhishek Pandey posted an Question
June 11, 2021 • 17:03 pm
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30 points
30 points
- CSIR NET
- Life Sciences
Plz describe the calvin cycle also consider the light dependent reaction
plz describe the calvin cycle also consider the light dependent reaction
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Calvin cycle is carbon fixation cycle of all oxygenic photosynthetic organisms...Four Calvin cycle enzymes are subject to a special type of regulation by light. Ribulose 5-phosphate kinase, fructose 1,6-bisphosphatase, sedoheptulose 1,7-bisphosphatase, and glyceraldehyde 3-phosphate dehydrogenase are activated by light-driven reduction of disulfide bonds between two Cys residues critical to their catalytic activities. When these Cys residues are disulfide-bonded (oxidized), the enzymes are inactive; this is the normal situation in the dark. With illumination, electrons flow from photosystem I to ferredoxin (see last Figure), which passes electrons to a small, soluble, disulfide-containing protein called thioredoxin in a reaction catalyzed by ferredoxin-thioredoxin reductase.