Whch of the following statements about enzmyes is true? responses enzymes raise activation energy for the cell. enzymes raise activation energy for the cell. enzymes are re-useable and can be used more than once in a chemical reaction. enzymes are re-useable and can be used more than once in a chemical reaction. enzymes are carbohydrates and are used as the main source of energy. enzymes are carbohydrates and are used as the main source of energy. enzymes are not substrate specific; they can bind to any substrate.