Composed of rRNA and proteins
Ribosomes
The structure you are referring to is called a ribosome. Ribosomes are cellular structures responsible for protein synthesis. They are composed of two subunits, a large subunit and a small subunit, that come together during protein synthesis and dissociate afterward.
The large subunit consists of rRNA (ribosomal RNA) molecules and various proteins. The rRNA molecules function as the site of protein synthesis, while the proteins provide stability and help in the overall functioning of the ribosome.
The small subunit also contains rRNA molecules and proteins. It plays a role in binding to the messenger RNA (mRNA) molecule and initiating the protein synthesis process.
Overall, ribosomes are essential for translating the genetic information stored in mRNA molecules into proteins by connecting amino acids in a specific sequence according to the instructions encoded in the mRNA.