CIE A Level Chemistry (9701) exams from 2022

Revision Notes

7.6.10 Peptide Bonds

Formation of Peptide Bonds

  • Each amino acid contains an amine (-NH2) and carboxylic acid (-COOH) group
  • The -NH2 group of one amino acid can react with the -COOH group of another amino acid in a condensation reaction to form a dipeptide
    • The new amide bond between two amino acids is also called a peptide link or peptide bond
  • Since this is a condensation reaction, a small molecule (in this case H2O) is eliminated
  • The dipeptide still contains an -NH2 and -COOH group at each end of the molecule which can again participate in a condensation reaction to form a tripeptide

Nitrogen Compounds - Formation of Peptide Bonds, downloadable AS & A Level Chemistry revision notes

A peptide bond is an amide bond between two amino acids

  • A polypeptide is formed when many amino acids join together to form a long chain of molecules

 

Nitrogen Compounds - Polypeptides, downloadable AS & A Level Chemistry revision notes

A polypeptide is a long chain of amino acid molecules joined together

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Fran has taught A level Chemistry in the UK for over 10 years. As head of science, she used her passion for education to drive improvement for staff and students, supporting them to achieve their full potential. Fran has also co-written science textbooks and worked as an examiner for UK exam boards.
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