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Glycolysis- the 6 carbon sugar (glucose) is broken down into two molecules of a 3 carbon molecule. This is called the pyruvate. This change is accompanied by a net gain of 2 ATP (adenosine triphosphate) molecules and 2 NADPH (nicotinamide adenine dinucleotide phosphate hydrogen) molecules.
Krebs cycle- pyruvate is transported into the mitochondria and loses carbon dioxide to form acetyl-CoA (2 carbon molecule). When this oxidized to carbon dioxide, the chemical energy is released and also captured in the form of ATP, NADPH, and FADH₂. The krebs cycle occurs in the mitochondrial matrix and generates a pool of chemical energy from the oxidation of pyruvate, which is the end product of glycolysis.

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