What are ribosomes primarily composed of?

What are ribosomes primarily composed of?

• A. rRNA and protein
• B. DNA and lipid
• C. mRNA and tRNA
• D. Carbohydrates and lipids

Answer: (A)

Ribosomes are ribonucleoprotein machines, built from ribosomal RNA and ribosomal proteins. The rRNA forms the catalytic center and the structural scaffold, while the proteins provide stability and assist in assembly and function. This combination appears in both bacterial and eukaryotic ribosomes, which split into a small and a large subunit, each containing rRNA and proteins. The RNA is specifically responsible for the peptidyl transferase activity that builds peptide bonds, not DNA or lipids. mRNA and tRNA are important players in translation but are separate RNA molecules, not the main structural components of the ribosome. Carbohydrates and lipids are other major biomolecules involved in energy storage and membranes, not ribosome construction. So the primary composition is ribosomal RNA and protein.

Ribosomes are ribonucleoprotein machines, built from ribosomal RNA and ribosomal proteins. The rRNA forms the catalytic center and the structural scaffold, while the proteins provide stability and assist in assembly and function. This combination appears in both bacterial and eukaryotic ribosomes, which split into a small and a large subunit, each containing rRNA and proteins. The RNA is specifically responsible for the peptidyl transferase activity that builds peptide bonds, not DNA or lipids. mRNA and tRNA are important players in translation but are separate RNA molecules, not the main structural components of the ribosome. Carbohydrates and lipids are other major biomolecules involved in energy storage and membranes, not ribosome construction. So the primary composition is ribosomal RNA and protein.