Home Biology Biotechnology and Its Application Statement Based Questions Arrange the following steps in the correct o…
Biology Biotechnology and Its Application Statement Based Questions Single Correct MCQ
Published on: August 21, 2026

Arrange the following steps in the correct order as they occur in the synthesis of human insulin using recombinant DNA technology:

A
Ligation of Human insulin-producing gene into the plasmid of E.coli.
, , , , (E),
B
Introduction of recombinant DNA into a bacterial cell.
, , , (E), ,
C
Treatment of plasmid and human DNA (consisting of insulin producing gene) with restriction enzymes.
, , , ,
D
Production of insulin by recombinant bacteria in a fermentation tank.
(E) Extraction and combination of chains A and B by creating disulfide bonds.
Choose the correct sequence of steps from the options given below: , (E) , (E)

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The correct answer is:
A

The synthesis of human insulin starts with treating plasmid and human DNA (consisting of gene of interest) with restriction enzymes to prepare them for ligation , followed by the ligation of the insulin gene into a plasmid of E.coli . This recombinant DNA is then introduced into a bacterial cell . The bacteria produce insulin in a fermentation tank , and finally, insulin chains A and B are extracted and combined via disulfide bonds to form functional human insulin (E).

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