Haemoglobin contains

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(A) Haemoglobin is a conjugated protein consisting of a protein part called globin and a non-protein prosthetic group called haem. The globin protein

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$95\%$ globin + $5\%$ haematin

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(A) Haemoglobin is a conjugated protein consisting of a protein part called globin and a non-protein prosthetic group called haem. The globin protein constitutes approximately $95\%$ of the total weight of the haemoglobin molecule. The remaining $5\%$ is composed of the haem group (iron-containing porphyrin ring),which is responsible for the red colour and oxygen-binding capacity of the blood. Therefore,the correct composition is $95\%$ globin and $5\%$ haematin (haem).

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