Fibrous proteins differ from globular proteins in that fibrous proteins are
- A. soluble in water and act as enzymes
- B. insoluble in water and serve structural roles
- C. always conjugated
- D. made of a single amino acid
Explanation
Long parallel chains bundled together make fibrous proteins tough and insoluble, which suits keratin in hair, collagen in tendons and fibroin in silk. Globular proteins fold into compact soluble balls with hydrophilic residues outside, which suits enzymes, antibodies and transport proteins. Both classes are built from the same twenty amino acids.
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