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The krebs cycle occurs in the mitochondria of the cell and it can occur in oth in plants as well as animal.
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Kreb cycle in plants occur in the cristae of mitochondria of a cell.
Firstly the each carbon pyruvic acid gets converted into acetyl-CoA,the pyruvic acid is broken down by an enzyme to one carbon molecule as carbon dioxide and the remaining 2 carbon atom combines with CoA.here the ion are transfferred to NAD to form high energy NADH.Acetyl-CoA enters the kreb cycle by combining with 4 atom of carbon forming oxaloacetic acid.At the end the final product is oxaloacetic acid.This begins the cycle and also end it up,here the molecule is ready to accept one more electron. 
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