Question

Process in which substrate is oxidised without any external electron acceptor

Answer 1

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Lactic acid fermentation -

The incomplete oxidation of pyruvate (from glucose) under anaerobic conditions forming lactic acid by Lactobacillus lactis (bacteria)

- wherein

Enzyme used is lactic acid dehydrogenase

In fermentation, the incomplete oxidation of glucose is achieved under anaerobic conditions by a set of reactions, where pyruvic acid is converted to CO2 and ethanol. The enzyme pyruvic acid, decarboxylase and alcohol dehydrogenase catalyse these reactions. In animals cells also, like muscles during exercise, where oxygen is inadequate for cellular respiration, pyruvic acid is reduced to lactic acid by lactate dehydrogenase. The reducing agent is NADH + H+.

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