how many atp molecules are formed through oxidative phosphorylation of one molecule of alpha ketoglutaric acid entering krebs cycle

Dear student.

1 molecule of α-ketoglutarate in Kreb's cycle will produce 2 NADH2, 1FADH, 1ATP (Substrate level) = 9 ATP.

2 molecule of α-ketoglutarate in Kreb's cycle will produce = 18 ATP.

NADH2  will be formed in two steps:
During the formation of α-ketoglutarate to Succinyl CoA and from malate to oxaloacetate.

FADH will be formed during the formation of succinate to fumerate.

NADH2  - 3 ATP


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