Insulin is secreted by beta-cells of the isle | vedclass

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(D) Insulin is a peptide hormone synthesized as a precursor called proinsulin. Proinsulin consists of three chains ($A, B,$ and $C$). During maturatio

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The functional nature of insulin is the same as that of proinsulin.

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(D) Insulin is a peptide hormone synthesized as a precursor called proinsulin. Proinsulin consists of three chains ($A, B,$ and $C$). During maturation,the $C$-peptide is removed to form functional insulin,which consists of two chains ($A$ and $B$) linked by disulphide bridges. Therefore,the functional nature of insulin is $NOT$ the same as that of proinsulin,as proinsulin is biologically inactive. Options $A, B,$ and $C$ are correct facts regarding insulin structure and regulation.

Column-$I$	Column-$II$
$A$. Alpha cells	$I$. Stimulates muscles for glycogenesis.
$B$. Beta cells	$II$. Decreases gastric secretions and absorption in digestive tract.
$C$. Delta cells	$III$. Inhibits the release of pancreatic juice.
$D$. $F$ cells	$IV$. Stimulates liver for glycogenolysis.

Insulin is secreted by $\beta$-cells of the islets of Langerhans. Which of the following statements is $NOT$ correct concerning insulin?

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