Final answer:
Proteins have a unique ability to function due to their amino acid composition, sequence, and three-dimensional shape. These factors determine the protein's structure and function. Proteins can bind specifically and tightly with other molecules, allowing them to carry out their specific roles in the body.
Step-by-step explanation:
Proteins have a unique ability to function due to factors such as their amino acid composition, sequence, and their three-dimensional shape. These factors are important for determining the protein's structure and function. For example, different amino acids have different chemistries, and the order of amino acids in a protein determines how it folds and functions. Additionally, proteins are able to bind specifically and tightly with other molecules, allowing them to carry out their specific roles in the body.