These small bodies found inside the nucleus of the cell which are made of proteins and rna and assemble ribosomes are nucleolus.
The nucleolus is the prominent structure in the nucleus involved in the asssembly of ribosomes in the eukaryotic cells. It is the largest structure in the nucleus of a cell. It is the site of the synthesis and processing of ribosomal RNA with ribosomal proteins forming the subunits of ribosomes. It is then sent to the rest of the cell or the cytoplasm where the subunits combine to form ribosomes. This process of making ribosomes in the nucleolus and the cytoplasm of the cell is ccalled the ribosomal biosynthesis.
