The two subunits of ribosomes are produced in the?

Question

The two subunits of ribosomes are produced in the?

Answer 1

In eukaryotes, ribosomes are made of four strands of RNA and are often attached to the membranes of the endoplasmic reticulum to form rough ER.

In prokaryotes, they are made of three strands of RNA and occur free in the cytoplasm.

Eukaryote ribosomes are produced and assembled in the nucleolus.

Three of the four strands are produced there, but one is produced outside the nucleolus and transported inside to complete the ribosome assembly. Ribosomal proteins enter the nucleolus and combine with the four strands to create the two subunits that will make up the completed ribosome.

Answer 2

Nucleus, it is rRNA... its RNA that has catalytic activity, so you have two ribosomal subunits comprised of just RNA, yet it does the job of a protein.  I taught genetics, I think the large ribosomal unit is 30S and the small is 16S... d**n im rusty.