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_7. Hemoglobin is a protein in red blood cells that is responsible for transporting oxygen throughout the body. Hemoglobin is
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7. The correct option is D) Quaternary

Explanation -

Hemoglobin has Quatenary structure of protein because it has multi subunits(4) of polypeptide chain.

Primary structure of proteins means the linear sequence of the amino acids. Secondary structure of the protein corresponds to the local 3D stucture like alpa sheets and beta plates. Tertiary struccture of the protein consists of the single polypeptide chain having a specific conformations and foldings. Quaternary structure consists of more than one polypeptide chain.

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