Statements related to human Insulin are given below. Which statements is/are correct about genetically engineered Insulin? Choose the most appropriate answer from the options given below :
- A, B and D only
- B only
- C and D only
- C, D and E only
Answer
(2) B only
Solution
As per NCERT, in 1983 Eli Lilly, an American company, prepared two DNA sequences corresponding to the A and B chains of human insulin and introduced them into plasmids of E. coli to produce the insulin chains. Chains A and B were produced separately, extracted and combined by creating disulphide bonds to form human insulin.
Statement B is correct for genetically engineered insulin.
Statements A and D describe the natural pro-hormone (with the extra C-peptide) made in the pancreas — this processing step was avoided in genetically engineered insulin.
Statements C and E describe insulin from the pancreas of slaughtered cattle and pigs (animal insulin), not genetically engineered insulin.
Answer: (2)