In a linear tetrapeptide (Constituted with different amino acids), (number of amino acids) - (number of peptide bonds) is

We are given a linear tetrapeptide constituted with different amino acids. We need to find the value of (number of amino acids) − (number of peptide bonds).

A tetrapeptide, by definition, is formed by joining 4 amino acids together. Now, when amino acids link to form a peptide chain, each peptide bond joins two adjacent amino acid residues. In a linear chain of $$n$$ amino acids, the number of peptide bonds is $$n - 1$$.

Here we have $$n = 4$$ amino acids, so the number of peptide bonds is $$4 - 1 = 3$$.

Hence, (number of amino acids) − (number of peptide bonds) = $$4 - 3 = 1$$.

Hence, the correct answer is 1.