Assertion :Insulin is a globular protein. Reason: It has two polypeptide chains with 21 and 30 amino acids joined by sulphur bridges connecting cysteine amino acid on the two chains.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The primary protein structure is defined as the specific sequence of amino acids in the protein. In order to function properly, peptides and proteins must have the correct sequence of amino acids.

Globular proteins are somewhat water-soluble (forming colloids in water), unlike the fibrous or membrane proteins. Globular proteins are mostly clumped into a shape of a ball. Insulin is a globular protein.

Insulin has two polypeptide chains ( $α$ and $β$ ) with 21 and 30 amino acids respectively, as seen in the figure above. The two chains are joined by sulphur bridges connecting cysteine residues on the two chains.

Both assertion and reason are correct and reason is the correct explanation for assertion.

Option A is correct.

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