Ribosome parts are manufactured in the nucleus of a cell, specifically within a region called the nucleolus.

Here's a breakdown:

* Nucleolus: This is a dense region within the nucleus where ribosomal RNA (rRNA) is transcribed and assembled with ribosomal proteins.

* Ribosomal RNA (rRNA): This type of RNA is transcribed from genes located within the DNA of the cell.

* Ribosomal proteins: These proteins are synthesized in the cytoplasm and then transported into the nucleus.

* Assembly: Within the nucleolus, rRNA and ribosomal proteins associate to form the two subunits of a ribosome: the small subunit and the large subunit.

These subunits are then transported out of the nucleus into the cytoplasm, where they can combine to form functional ribosomes ready to carry out protein synthesis.