The linkage that joins amino acid units in a protein is
Correct answer: B. a peptide linkage, formed by condensation between a carboxyl and an amino group
- A. a glycosidic linkage
- B. a peptide linkage, formed by condensation between a carboxyl and an amino group
- C. an ester linkage
- D. a hydrogen bond
Explanation
The carboxyl group of one amino acid condenses with the amino group of the next, releasing water and leaving a CO-NH amide link known as the peptide bond. Glycosidic links join sugars and ester links join glycerol to fatty acids, so each class of macromolecule has its own characteristic linkage. Hydrogen bonds are important in proteins but hold the chain in shape rather than joining the units.
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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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