A: Each protein molecule is a polymer of amin | vedclass

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(B) Assertion $A$ is true because proteins are indeed heteropolymers formed by the polymerization of amino acids linked by peptide bonds.Reason $R$ is

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$A$ and $R$ are both true,but $R$ is not the correct explanation of $A$.

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(B) Assertion $A$ is true because proteins are indeed heteropolymers formed by the polymerization of amino acids linked by peptide bonds.Reason $R$ is also true because there are $20$ standard amino acids that serve as the building blocks for proteins in living organisms.However,the fact that there are $20$ types of amino acids does not explain why proteins are polymers; rather,it describes the diversity of the monomers that make up the polymer.Therefore,$R$ is not the correct explanation for $A$.

$A$: Each protein molecule is a polymer of amino acids.
$R$: There are $20$ types of amino acids in living cells.

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$A$: Each protein molecule is a polymer of amino acids.$R$: There are $20$ types of amino acids in living cells.