Energetics ( ATP Account) of Aerobic Respiration:

1. In Glycolysis

a) ATPs formed: (By substrate level phosphorylation)

i) 1, 3- diPGA to 3PGA 2 ATPs

ii) PEPA to PA 2 ATPs

Total: 4 ATPs

b) ATPs used:

i) Gl to Gl-6- P0₄ 1 ATP

ii) Fr-6 PO to Fr-1, 6-diP0₄ 1 ATP

Total: 2ATPs

 

2.. Krebs Cycle

ATPs formed:(By substrate level phosphorylation).

Succinyl CoA to Succinate 1 x 2 = 2ATPs

3. Terminal Oxidation (through ETS)

i) From NADH2: 10NADH2 X 3ATP 30ATP

ii) From FADH2 : 2FADH2 X 2 ATP 4ATP

34 ATPs

 

Total ATPs formed

(4 + 2 + 34) = 40 ATPs

Total ATPs used = 2 ATPs

Net gain 38 ATPs