Which of the following statements correctly differentiates ribozymes from protein enzymes?

• A. Protein enzymes can only catalyze reactions in the forward direction.
• B. Ribozymes are more efficient than protein enzymes in catalyzing reactions.
• C. Ribozymes are RNA molecules that catalyze reactions, while protein enzymes are made of amino acids.
• D. Ribozymes are consumed during the reaction, unlike protein enzymes.

Answer: (C)