Question : Silk fibre chemically is:
Option 1: carbohydrate
Option 2: Fat
Option 3: Protein
Option 4: Cellulose
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Correct Answer: Protein
Solution : The correct option is - protein
Silk is primarily composed of fibroin, a protein based polymer. Chemically, fibroin consists of amino acids, including glycine, alanine, and serine, linked together in a specific sequence. These amino acids form the repeating units of the fibroin protein chain. Additionally, silk fibers often contain a coating of sericin, which is another protein that binds the fibroin strands together and gives silk its characteristic luster. So, chemically, silk is primarily a protein-based fiber composed of fibroin and sericin.
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