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

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

Correct answer: fermentation

Solution

Fermentation is an energy-releasing process where a substrate is oxidized without using an external electron acceptor. Instead, electrons are passed to an internal organic acceptor, allowing glycolysis to continue.

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