The test which is used for the identification of amino-acids is_________________?
Correct answer: A. Ninhydrin test
- A. Ninhydrin test
- B. Molisch test
- C. Biuretic test
- D. Benedict test
Explanation
Ninhydrin reacts with the free amino group of most amino acids to produce a characteristic deep blue or purple colour, so it is used for their identification. Molisch tests carbohydrates, Biuret tests peptide bonds in proteins, and Benedict tests reducing sugars. The likely mistake is choosing the Biuret test because amino acids are related to proteins, although free amino acids do not give the same peptide-bond test.
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About Classification of Proteins
Proteins are classified by composition as simple, conjugated and derived proteins, and by shape as fibrous or globular proteins. The topic relates these classes to examples such as albumin, keratin, collagen, haemoglobin and casein, while distinguishing structural proteins from proteins with transport, catalytic or regulatory roles.
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