The total number of ATP formed in the aerobic respiration from one glucose molecule is:

Question

The total number of ATP formed in the aerobic respiration from one glucose molecule is: (A) 30 (B) 38 (C) 40 (D) 24

Tardigrade Admin · Accepted Answer

The energetics of aerobic respiration is as follows:

ATP Consuming Reactions

Phosphorylation-I	$Gl u cose + A TP \to_{M g^{2 +}}^{He x o kina se} Gl u cose 6 - P h os p ha t e + A D P$	-1 ATP	-1 ATP
Phosphorylation-II	$F r u c t ose 6 - P h os p ha t e + A TP \to_{M g^{2 +}}^{P h os p h o f r u c t o kina se} F r u c t ose 1, 6 - B i p h os p ha t e$	-1 ATP	-1 ATP
	Net Gain		8 ATP

Energetics of Link reaction

Reaction Type	Reaction	Products of reaction	In terms of ATP
Dehydrogenation	$P yr uv a t e + C o A + N A D^{+} \to_{M g^{+ 2}, TPP, L i p o i c a c i d}^{P yr uv a t e d e h y d ro g e na se} A ce t y l C o A + N A D H_{2} + C O_{2}$	2 x NADH₂	6 ATP

Energetics of Kreb's cycle/TCA cycle

Reaction Type	Reaction	Products of reaction	In terms of ATP
Dehydrogenation-I	$I soc i t r a t e + N A D^{+} \to_{M n^{+ 2}}^{I soc i t r a t e d e h y d ro g e na se} O x a l os u cc ina t e + N A D H_{2}$	2 x NADH₂	6 ATP
Oxidative decarboxylation	$α - Ke t o g l u t a r a t e + C o A + N A D^{+} \to_{M g^{+ 2}, TPP, L i p o i c a c i d}^{α - Ke t o g l u t a r a t e d e h y d ro g e na se} S u cc in y l C o A + N A D H_{2} + C O_{2}$	2 x NADH₂	6 ATP
Dehydrogenation III	$S u cc ina t e + F A D \to S u cc ini c d e h y d ro g e na se F u ma r a t e + F A D H_{2}$	2 x FADH₂	4 ATP
Dehydrogenation IV	$M a l a t e + N A D^{+} \to M a l a t e d e h y d ro g e na se O x a l o a ce t a t e + N A D H_{2}$	2 x NADH₂	6 ATP
Substrate-level Phosphorylation	$S u cc in y l C o A + G D P + P i \to S u cc in y l C o A sy n t h e t a se / S u cc in y l t hi o kina se S u cc ina t e + GTP + C o A$	2 x 1 GTP	2 ATP
	Net gain		24 ATP
	Net gain in aerobic respiration (Glycolysis + Link reaction + Kreb's cycle)	8 ATP + 6 ATP + 24 ATP	38 ATP

Q. The total number of ATP formed in the aerobic respiration from one glucose molecule is: