Question

The RNA world hypothesis proposes that the first complex molecule was RNA and it preceded protein formation. Which major function of the ribosomal RNA supports the hypothesis?

a) Catalyzing peptide bond formation
b) Carrying amino acids to the ribosome
c) Recognizing start codons
d) Forming the ribosome structure

Answer 1

To support the RNA world hypothesis, the key function of ribosomal RNA is its enzymatic activity in catalyzing peptide bond formation, which is essential for protein synthesis.

Step-by-step explanation:

To support the RNA world hypothesis, the key function of ribosomal RNA is its enzymatic activity in catalyzing peptide bond formation, which is essential for protein synthesis. The RNA world hypothesis suggests that RNA was the first complex molecule, serving as a precursor to the formation of proteins. One major function of ribosomal RNA (rRNA) that supports this hypothesis is its catalytic role in protein synthesis.

The rRNA is not only a structural component of ribosomes but also acts as an enzyme, particularly performing the function known as peptidyl transferase, which catalyzes the formation of peptide bonds between amino acids. This enzymatic activity is crucial evidence supporting the RNA world hypothesis because it implies that RNA could perform the essential functions for life, such as catalysis and information storage, before proteins were formed.