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The energy-releasing metabolic process in which substrate is oxidised without an external electron acceptor is called:

1. glycolysis
2. fermentation
3. aerobic respiration
4. photorespiration

Correct answer: fermentation

Solution

Fermentation is an energy-releasing process in which a substrate is oxidized without using an external electron acceptor. Instead, an internal organic compound accepts the electrons, allowing ATP production to continue under anaerobic conditions.

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