Final answer:
The statement about predicting the function of all proteins based solely on their quaternary structure is false. The quaternary structure is not a definitive indicator of a protein's function. Amino acids being "recycled" refers to their reuse in the synthesis of new proteins and other metabolic activities.
Step-by-step explanation:
The statement that you can tell the function of all proteins from their quaternary structure is False. The quaternary structure refers to the arrangement and interaction of multiple polypeptide chains (subunits) in a multi-subunit protein, but it does not always provide complete insights into the function of the protein. Different proteins have different modes of action, and while the quaternary structure contributes to the protein's stability and functionality, it cannot solely reveal the entire functionality of the protein.
When the reading indicates that amino acids are "recycled," it means that when proteins are broken down, the individual amino acids can be reused to build new proteins or to be involved in other metabolic processes. This is the body's way of conserving resources and maintaining a balance of amino acids for various cellular functions.