Natural silk fibre is:
Correct answer: C. Protein
- A. Polyester
- B. Lipid
- C. Protein
- D. Polysaccharide
Explanation
Silk is a natural fiber that is primarily composed of the protein fibroin, secreted by silkworms. This makes Option C, 'Protein,' the correct answer. Polyester (Option A) is a synthetic polymer, lipids (Option B) are fats and oils, and polysaccharides (Option D) are carbohydrates. None of these are the primary components of natural silk fibers.
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The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
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