amino acids?

Question

how can two protiens with the exact same number and type of amino acids have different primary structures?

Answer 1

Consider glycine (gly), alanine (ala), and valine (val). Four of the several possibilities are:

Gly-Ala-Val Gly-Val-Ala Val-Ala-Gly Val-Gly-Ala

But they're all different. Draw out the molecular structures and you'll see.

Answer 2

because the different amino acids can bind in a different order meaning there are many many different combinations to make up millions of different proteins