Final answer:
rRNAs are more important than proteins for the peptidyl transferase reaction in protein synthesis.
Step-by-step explanation:
Proteins and rRNAs both play important roles in the peptidyl transferase reaction, which is a key step in protein synthesis. However, rRNAs are more directly involved in the catalytic activity of ribosomes and the formation of peptide bonds between amino acids.
The rRNA acts as an enzymatic ribozyme, while proteins contribute to the structure and function of the ribosomes. Therefore, in the context of the peptidyl transferase reaction, rRNAs can be considered more important than proteins.