Which of the following statements regarding the structure of proinsulin and mature insulin are not correct?
(i) Proinsulin is made up of three polypeptide chains - A, B and C.
(ii) C-polypeptide chain with 33 amino acids is removed prior to insulin formation.
(iii) Mature insulin is made up of 51 amino acids arranged in two polypeptide chains- 
and 
.
(iv) Polypeptide chain 
has 30 amino acids and polypeptide chain 
has 21 amino acids
(v) Polypeptide chains A and B are interconnected by only one 
- S linkage.
Text Solution
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