There is complete breakdown of glucose in fermentation.

Pyruvic acid is formed in the mitochondrial matrix during respiration.

Enzyme enolase catalyse the conversion of 2-phosphoglycerate to 2phosphoenolpyruvate.

Fructose - 6 - phosphate is converted to fructose 1,6 diphosphate by enzyme isomerase.

$\mathrm{Mn}^{++}$

$\mathrm{Mg}^{++}$

$\mathrm{Ca}^{++}$

$\mathrm{Zn}^{++}$

10

22

24

34

Oxidative carboxylation

Oxidative phosphorylation

Decarboxylation

Substrate level phosphorylation