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How many polypeptide chains does insulin consist of?(a) 4(b) 3(c) 2(d) 1The question was asked at a job interview.I need to ask this question from Biotechnological Applications in Medicine: Genetically Engineered Insulin in chapter Biotechnology and its Applications of Biology – Class 12

Answer»

The correct answer is (c) 2

Easiest explanation: Insulin consists of TWO polypeptide CHAINS. These are known as A chain and B chain. A chain is made up of 21 amino ACIDS while the B chain is made up of 30 amino acids. Thus, MAKING insulin a polypeptide containing 51 amino acids.



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