Question

The ribosome is important for catalyzing the formation of peptide bonds. Which of the following statements is true? (a) The number of rRNA molecules that make up a ribosome greatly exceeds the number of protein molecules found in the ribosome. (b) The large subunit of the ribosome is important for binding to the mRNA. (c) The catalytic site for peptide bond formation is formed primarily from an rRNA. (d) Once the large and small subunits of the ribosome assemble, they will not separate from each other until degraded by the proteasome.

Answer 1

The correct answer is: c) The catalytic site for peptide bond formation is formed primarily from an rRNA

Ribosomal ribonucleic acid (rRNA) together with proteins is the major  component of the ribosome. rRNA is essential for protein synthesis in all living organisms. Ribosomes contain two major rRNAs (and abot 50 proteins) that form two ribosomal subunits, the large one and the small one. The large subunit rRNA has a function of ribozyme: catalyzes peptide bond formation.