Insulin is
(A) Protein
(B) Lipid
(C) Fat
(D) None
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Answer:
A)Protein
Explanation:
Biochemically , Insulin is protein in nature.
The ultrastructure of proteins is as follows :
1. It contains 2 polypeptide chains
2. The 1st chain contains 21 Amino Acid. The 2nd chain contains 30 Amino acids (total 51 Amino acids)
3. The 1st chain is called Phenyl-alanine chain, whereas the 2nd chain is Glycine chain.
4. The chains are connected by Di-sulphide bonds. [ S ---S linkage]
5. Total 3 Di-sulphide linkages are present { 2 inter-chain linkages and 1 intra-chain linkage}
6. It's sequence was discovered by Frederick Sanger.
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