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

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A tetrapeptide is a peptide, classified as an oligopeptide, since it only consists of four amino acids joined by peptide bonds.
A peptide bond, also referred to as an amide bond, is formed between the α-nitrogen atom of one amino acid and the carbonyl carbon of a second.
Example of tetrapeptide is: $Tuftsin \{(L - threonyl) - (L - lysyl) - (L - prolyl) - (L - arginine)\}$ is a peptide related primarily to the immune system function
As we can see in this example
No. of Amino Acids $= 4$
No. of Peptide bonds $= 3$
Hence, (number of amino acids) - (number of peptide bonds) $= 1$

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