True or False: All Enzymes Are Protein?

The statement is false. While the majority of enzymes are indeed proteins, there are exceptions to this rule. Specifically, some enzymes known as ribozymes are composed of RNA rather than protein. Ribozymes catalyze certain biochemical reactions, demonstrating that not all enzymes fit the classic protein structure. Therefore, while proteins represent the predominant category of enzymes, the existence of ribozymes shows that enzymes can also be made from nucleic acids.