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Q. How many $ATPs$ are formed per glucose molecule in Krebs’ cycle?

Respiration in Plants

Solution:

$ATP$ Production in respiration
I. Giycoiysis :
1. $PGAL$ to $BPGA : 2 NADH \to 6\,ATP$
2. $BPGA$ to $3 PGA \to 2\,ATP$
3. $PEP$ to $PA \to 2\,ATP$
$2\,ATP$ are utilised, so net gain $\to 8\,ATP$ $II$. PA to Acetyl CoA: $2NADH \to 6ATP$
$III$. Krebs' cycle:
1. Isocitrate to $\alpha$-ketoglutarate: $2NADH \to 6ATP$
2. $\alpha$-Ketoglutarate to succinyl $CoA :2NADH \to 6ATP$
3. Succinyl CoA to succinic acid $\to 2ATP$
4. Succinic acid to fumaric acid : $2FADH_{2} \to 4ATP$ 5. Malic acid to $OAA : 2NADH \to 6ATP$
Net gain in Krebs’ cycle $\to 24\,ATP$
Oxidation of one molecule of pyruvic acid produces $15 \,ATP$
Oxidation of one molecule of acetyl CoA produces $12\, ATP$