Long, coiled, polypeptide chains that make up approximately 97% of the hair's structure are which proteins?

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Multiple Choice

Long, coiled, polypeptide chains that make up approximately 97% of the hair's structure are which proteins?

Explanation:
Hair is built primarily from keratin proteins, which are long, coiled polypeptide chains that assemble into tough fibrous filaments. In the hair shaft, these keratin molecules form hard keratin with many cross-links (disulfide bonds), giving hair its strength, durability, and rigidity. This major structural makeup aligns with the statement that about 97% of hair’s protein is keratin. The other options—collagen, elastin, and actin—play roles in other tissues or cellular structures and do not form the main filamentous framework of hair. So the best answer is keratin proteins.

Hair is built primarily from keratin proteins, which are long, coiled polypeptide chains that assemble into tough fibrous filaments. In the hair shaft, these keratin molecules form hard keratin with many cross-links (disulfide bonds), giving hair its strength, durability, and rigidity. This major structural makeup aligns with the statement that about 97% of hair’s protein is keratin. The other options—collagen, elastin, and actin—play roles in other tissues or cellular structures and do not form the main filamentous framework of hair. So the best answer is keratin proteins.

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