Verified answer

Answer:

I think four is correct

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Answer:

In 1983, Eli Lilli an American company prepared two DNA sequences corresponding to A and B, Chains of human insulin and introduced them in plasmids of E.coli to produce polypeptide chains of insulin.

To minimize the complexity in the production of insulin by overcoming the process maturation of insulin by removal of C-peptide the Chains A and B were produced separately, extracted and combined by creating disulfide bonds to form human insulin(active).

Hence Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.

Explanation:

4 has correct