Can anyone tell me wat is meant by primary and secondary metabolic pathway?
A primary metabolic pathway is evolutionally the oldest and functionally active energy releasing pathway from a substrate. Krebss cycle explains it easily Secondary pathway are phylogenetically recent pathways that use a low energy substrate to energy under anaerobic or pathological conditions Primary ) Citrate -.isocitrate -alfa keto glutarate – succinyl coenzyme A- fumarate — to citrate again — is the primary pathway governing when carbohydrate is the main substrate Anerobic and pathological conditions require energy release from fats and proteins . So the steps are modified at every stage. Secondary ) Acetyl co A — co A -aconitase -hydration to iso citrate- carboxylatio to alfa keto glutarate – co A- SH – succinate – ATP -de hydrogenation to fumarate — hydration to — maleate –dehydrogenation to – oxalo acetate – to citrate again.
