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Why are hemoglobin red?

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It is due its bound porphyrin moiety which imparts red color. This misconception should be cleared that it is not due to iron bound to porphyrin.
[Note: porphyrin+iron ------> heme ,,,, heme+globin------> hemoglobin]
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Does red meat increase hemoglobin?

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Reduction of hemoglobin in red blood cells?

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Why does hemoglobin make blood red?

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Will blood be red without hemoglobin?

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