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Question

Percentage ratio of fibroin to sericin in silk is80:2050:4030:7040:60

A
50:40
B
80:20
C
40:60
D
30:70
Solution
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The chemical composition of silk fibre by weight are, in general, 75-83% of silk fibroin, 17-25% of sericin, 1.5% of wax and about 1-2% of others, such as hydrocarbon. Fibroin is the core silk protein and sericin is the surface gum like compound. Thus, the correct answer is option B.

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