[Campbell Biology P.399] Which statement accurately describes the composition and primary fu... | Practice Question

Which statement accurately describes the composition and primary functional component of a ribosome?

  • A: Ribosomes are primarily composed of proteins, with rRNA supporting their structural integrity.
  • B: Ribosomes consist of one-third protein and the rest rRNA, with rRNA being primarily responsible for catalysis.
  • C: Eukaryotic ribosomes contain three rRNA molecules, while bacterial ribosomes contain four.
  • D: Ribosomal proteins are solely responsible for peptide bond formation.

Explanation

The text states that about one-third of the mass of a ribosome is made up of proteins, and the rest consists of rRNA. It also explicitly mentions that rRNAs are primarily responsible for the structure and function of the ribosome and act as the catalyst for peptide bond formation.