The newly created C-N bond between the two separate amino acids is called a peptide bond. The term 'peptide bond' implies the existence of the peptide group which is commonly written in text as -CONH- .
Two molecules linked by a peptide bond become what is called a dipeptide. A chain of molecules linked by peptide bonds is called a polypeptide.
A protein is made up of one or more polypeptide chains, each of which consists of amino acids which have been mentioned earlier.
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