"In living organisms, every protein—a type of biological polymer consisting of hundreds of amino acids—carries out specific functions, such as catalysis, molecule transport, or DNA repair. To perform these functions, they must fold up into specific shapes."

This is not true. There are some proteins that are intrinsically disordered, not folding into any preferred way, but they still perform biological functions.

https://en.wikipedia.org/wiki/Intrinsically_disordered_prote...