Ribulose bisphosphate carboxylase is a chemical that aids in the process of photosynthesis. Ribulose bisphosphate carboxylase breaks down carbon dioxide and bonds carbon atoms together to begin the formation of sugars. Without ribulose bisphosphate carboxylase, photosynthetic organisms would not be able to produce as much food. Even though ribulose bisphosphate carboxylase is involved in assisting chemical reactions, its chemical structure is unchanged. Based on the information about the function of ribulose bisphosphate carboxylase, what is the best classification of the chemical?