Why some reactions of glycolysis are reversible and some irreversible?
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Glycolysis irreversible:
The reason for this intricate process is both because the direct conversion of PEP to pyruvate is irreversible and because the cell must avoid a futile cycle in which pyruvate from glycolysis is immediately converted back to PEP.
Glycolysis reversed:
Gluconeogenesis is much like glycolysis only the process occurs in reverse. However, there are exceptions. In glycolysis there are three highly exergonic steps (steps 1,3,10). These are also regulatory steps which include the enzymes hexokinase, phosphofructokinase, and pyruvate kinase.
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