The reaction that joins two amino acids releases
Correct answer: B. a molecule of water
- A. carbon dioxide
- B. a molecule of water
- C. ammonia
- D. hydrogen
Explanation
Condensation between the carboxyl group of one residue and the amino group of the next expels water and creates the peptide link. The reverse process, hydrolysis, adds water back and is how proteins are digested. Every biological polymer is assembled by condensation and broken by hydrolysis.
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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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