BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Human insulin consists of 51 amino acids, divided into two chains, commonly labelled A and B, with 21 and 30 amino acids respectively. The chains are linked by three disulfide bridges, two forming interchain cystines at A7-B7 and A20-B19, and one forming an intrachain cystine at A6-A11.

Detailed explanation-2: -Insulin is a protein chain or peptide hormone. There are 51 amino acids in an insulin molecule. It has a molecular weight of 5808 Da. Insulin is produced in the islets of Langerhans in the pancreas.

Detailed explanation-3: -Insulin is a protein formed of two polypeptide chains. The two polypeptide chains consist of 51 amino acids and designated as A (21 amino acid residues) and B (30 amino acid residues). Insulin is first synthesized as preproinsulin made up of 110 amino acid residues. Preproinsulin is a biologically inactive precursor.

Detailed explanation-4: -Insulin is a peptide hormone composed of 51 amino acids, with a molecular weight of 5808 Da.

Detailed explanation-5: -Insulin was found to be a polypeptide in 1928 with its amino acid sequence identified in 1952. It is in fact a dipeptide, containing A and B chains respectively, linked by disulphide bridges, and containing 51 amino acids, with a molecular weight of 5802.