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What protein makes up spider silk?

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What protein makes up spider silk?

(a) Keratin

(b) Fibrin

(c) Collagen

(d) Elastin

The question was posed to me during an online interview.

Question is from Chemical Basis of Life in portion Chemical Basis of Life of Cell Biology

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Right choice is (c) Collagen

Easy explanation: Spider silk is a collagen molecule made up of 3 alpha helices wound together in a triple helix format. It is rich in hydrophobic residues as well as glycine and proline to incorporate a flexible nature to it. Collagen is also found in our bones and tendons.

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