Which one of the following is a structural protein?

Keratin

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Hemoglobin

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Amino acid

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Gelatin

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Solution

The correct option is A Keratin
Keratin is a structural protein found in hair and nails etc.
Hemoglobin is a protein in blood, that carries oxygen from the lungs to the tissues. It is a functional protein.
Amino acid is the monomer unit of a protein and gelatin is a form of irreversibly hydrolyzed collagen.

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