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Question

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

A
Fermentation
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B
Aerobic respiration
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C
Photorespiration
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D
Glycolysis
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Solution

The correct option is C Glycolysis
Cellular respiration aims at producing energy in the form of ATP and occurs in every living cell. The respiration starts with glycolysis, a stepwise process that oxidises respiratory substrate like glucose. Oxidation is in the form of removal of hydrogen and there is no external electron acceptor present.
So the answer is 'Glycolysis'.

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