Question detail
What is formed during the condensation reaction between two amino acids?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Amino acids, proteins and DNA (A-level only)
Question
- A. A peptide bond
- B. An ester bond
- C. A hydrogen bond
- D. A disulfide bond
Answer
A peptide bond
Explanation
During the condensation reaction between two amino acids, a peptide bond is formed, linking the amine group of one amino acid to the carboxylic acid group of another, releasing a molecule of water.
Common mistake
Peptide Bond Drawing Error
Students often incorrectly draw the peptide bond by not showing the correct connection between the amine and carboxylic acid groups.
To correctly draw a peptide bond, remember that it forms between the carbon of the carboxylic acid group and the nitrogen of the amine group. The formula for the peptide bond is R1CO-NHR2, where R1 and R2 are the side chains of the amino acids. Ensure to illustrate the loss of a water molecule (H2O) during the condensation reaction.
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