Which of the following activities occurs in internal respiration?

Oxidative enzymatic reaction

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Non-oxidative enzymatic reaction

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Breathing

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Both A and B

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Solution

The correct option is D Both A and B
Internal respiration is the process of exchange of gases between the cells of the body and the blood. it shows oxidative and non-oxidative enzymatic reaction with the help of respiratory enzymes. These enzymes assist transfer of electrons from one molecule from to another. These transfers are called redox reactions.
So the correct answer is 'Both A and B'

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