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Question

Deamination is first step in urea formation which means

A
Reduction of ammonia
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B
Oxidation of ammonia
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C
Addition of amino group to organic molecule
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D
Removal of amino group to organic molecule
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Solution

The correct option is D Removal of amino group to organic molecule
Urea is the major end product of nitrogen metabolism in humans and mammals. Ammonia, the product of oxidative deamination reactions, is toxic in even small amounts and must be removed from the body. The urea cycle or the ornithine cycle describes the conversion reactions of ammonia into urea. Since these reactions occur in the liver, the urea is then transported to the kidneys where it is excreted. Deamination is the removal of an amine group from a molecule. Enzymes that catalyse this reaction are called deaminases. In the human body, deamination takes place primarily in the liver.

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