Fibrous proteins differ from globular proteins in that fibrous proteins are
Correct answer: B. insoluble in water and serve structural roles
- 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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About Classification of Proteins
Proteins are classified by composition as simple, conjugated and derived proteins, and by shape as fibrous or globular proteins. The topic relates these classes to examples such as albumin, keratin, collagen, haemoglobin and casein, while distinguishing structural proteins from proteins with transport, catalytic or regulatory roles.
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