The general name for something that binds to a protein is Se

The general name for something that binds to a protein is Select one: substrate domain coenzyme inhibitor ligand

Solution

C. Coenzyme

A coenzyme can bind to the protein portion of the enzyme either covalently or noncovalently. Some cofactor are simple metal ions and other cofactor are complex organic group which are called coenzyme. Binding of coenzyme is necessary for the activity of the protein.