Introduction to the Digestive System of the Human Body

Polypeptides are substances whose molecules consist of three* or more amino acids linked together by peptide bonds. (Note that the prefix "poly-" indicates "many", implying a structure consisting of multiple units attached together.)

For comparison:

  • Two amino acids linked together by a peptide bond form a dipeptide, whereas
  • Three or more amino acids linked together by a peptide bond form a polypeptide.

An example of a polypeptide
is a protein.

All protein molecules are polypeptides.

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