What determines the structure and functions of a protein is the sequence of its amino acids.
Proteins are macromolecules found in every living organism. They are polymers of amino acids linked together by peptide bonds.
There are 20 amino acids in nature. These amino acids combine in different sequences to form the primary structures of different proteins.
The secondary structures of these proteins are formed when the primary structures are folded in a specific way. Proteins with the same primary but different secondary structures will function differently.
In the same vein, proteins with different amino acid sequences but folded in the same way would still differ in functions.
Thus, the primary determinant of the structure of proteins is the sequence of amino acids.
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