(C) Hemoglobin $(Hb)$ is a quaternary protein found in red blood cells.It consists of $4$ polypeptide subunits.Specifically, adult human hemoglobin $(

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$2$ - $\alpha$ chain, $2$ - $\beta$ chain

(C) Hemoglobin $(Hb)$ is a quaternary protein found in red blood cells.It consists of $4$ polypeptide subunits.Specifically, adult human hemoglobin $(HbA)$ is composed of $2$ $\alpha$ chains and $2$ $\beta$ chains.Therefore, the correct structure is $2$ - $\alpha$ chain and $2$ - $\beta$ chain.