Question

Number of peptide bonds fomed by two amino acids is/are :

Answer 1

Number of peptide bonds = Number of amino acids$-1$
For example, when glycine and alanine, the two amino acids form a dipeptide (called glycylalanine), have only one peptide bond in between them which is formed by $COOH$ group of glycine and $N{H}_2$ group of alanine as shown below:
Hence 1 is correct.