Question

A student claimed that the following two proteins are the same protein because they contain the same amino acids: (1) Pro-Arg-Lys-Iso-Gly and (2) Pro-Arg-Lys-Gly-Iso. Do you agree or disagree with the student?

Answer 1

Disagree

Step-by-step explanation:

Proteins are made up of chains of amino acids, these fold up and join up with other polypeptides to form the final structure of the protein.

The amino acids are in a different order (Iso and Gly are swapped around). This means the polypeptide chain is different, meaning the final structure and likely the function of the protein will be different.

Therefore, the proteins are certainly not the same protein.