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D
Glycolysis
4.2 The first stage of respiration of glucose, occurring in cellular cytoplasm
There are two variations of the respiration of glucose: aerobic and anaerobic. Each of these types of respiration has only
one `stage' in common, and that is glycolysis. This is a metabolic pathway which is the…

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Forming the pyruvate
Next, two hydrogen atoms are removed from each triose phosphate using dehydrogenase enzymes, which are aided by
NAD (nicotinamide adenine dinucleotide), a hydrogen acceptor, so one molecule of NAD combines with the two hydrogen
atoms from each triose phosphate molecule, resulting in one reduced NAD molecule for…

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