Proteins are classified as fibrous or globular. A fibrous protein such as keratin is
Correct answer: A. insoluble in water and structural in function
- A. insoluble in water and structural in function
- B. soluble in water and catalytic in function
- C. always an enzyme
- D. made of a single amino acid repeated
Explanation
Fibrous proteins consist of long parallel chains held in bundles, which makes them tough, insoluble and suited to structural roles in hair, nails, tendons and skin. Globular proteins fold into compact soluble balls with hydrophilic groups outside, which is what enzymes, antibodies and haemoglobin require. Both types are built from the same twenty amino acids in different sequences.
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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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