(B) Hemoglobin $(Hb)$ is a quaternary protein structure found in red blood cells.It consists of $4$ polypeptide chains (subunits).These chains are arr

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(B) Hemoglobin $(Hb)$ is a quaternary protein structure found in red blood cells.It consists of $4$ polypeptide chains (subunits).These chains are arranged as two alpha ($\alpha$) chains and two beta ($\beta$) chains.Therefore, the total number of peptide chains present in $Hb$ is $4$.