The reaction that joins two amino acids releases
- 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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