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What is the fundamental unit of collagen?

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What is the fundamental unit of collagen?

(a) Tropocollagen

(b) Hydroxyproline

(c) Hydroxylysine

(d) Glycine

This question was posed to me during an interview for a job.

Enquiry is from Fibrous and Globular Proteins in portion Biomolecules and Catalysis of Life Sciences

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Right choice is (a) Tropocollagen

For explanation: A typical collagen is long, stiff, inelastic and triple-stranded helical structure and is made up of tropocollagen. Tropocollagen consists of 3-coiled α chains. While hydroxylysine, hydroxyproline, and glycine are the amino acid sequence of tropocollagen.

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