Silk consists of

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(B) Silk fiber is primarily composed of a central core of the protein $Fibroin$,which provides the structural strength and flexibility to the fiber.Th

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Central core of fibroin

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(B) Silk fiber is primarily composed of a central core of the protein $Fibroin$,which provides the structural strength and flexibility to the fiber.This $Fibroin$ core is surrounded by a coating of another protein called $Sericin$,which acts as a glue to hold the fibers together.$Fibroin$ molecules are arranged in $\beta$-pleated sheets,which contribute to the characteristic properties of silk.

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