A) Fibroin
B) Casein
C) Sericin
D) a and c both
Correct Answer: D
Solution :
Silk is a pasty secretion of the silk worm produced by the silk gland. This secretion forms two cores of fibroin. A tough elastic insoluble protein consisting of 75% of the fiber?s weight and cemented together with sericin from the middle region of the silk gland.
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