(A) Hemoglobin is a quaternary protein structure found in red blood cells. It consists of $4$ polypeptide chains: $2$ alpha $(\alpha)$ chains and $2$

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(A) Hemoglobin is a quaternary protein structure found in red blood cells. It consists of $4$ polypeptide chains: $2$ alpha $(\alpha)$ chains and $2$ beta $(\beta)$ chains. Each chain is associated with a heme group containing iron, which allows the molecule to bind oxygen.