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Question

Biological oxidation of respiratory substrate causes

A
Gain of oxygen
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B
Gain of hydrogen
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C
Loss of oxygen
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D
Loss of hydrogen
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Solution

The correct option is C Loss of hydrogen
The food that we take in is biologically oxidized with the help of enzymes present in the body to release energy in the form of ATP. This process is known as respiration which involves the respiratory breakdown of various substrates such as carbohydrates, fats or proteins. Since it is an oxidation process it involves the loss of hydrogen atoms. During this process reducing equivalents NADH, FADH2 are produced which are electron rich. They donate electrons to the oxygen that we respire which releases energy that is used to bring about the biological processes off life.
Thus, the correct answer is option D.

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