Ribosomes are known as protein factories because they are the main site of protein synthesis. The molecule of RNA which is a component of the ribosome organelle is called a ribosomal RNA.
Ribosomes are composed of ribonucleic acids and proteins.
It is made up of two subunits-
Large subunits- join amino acids to form a polypeptide chain.
Small subunits- reads RNA.
So, each subunit is made up of one or more of ribosomal RNA and ribosomal proteins.