A dense, irregularly shaped region within the nucleus in which subunits of ribosomes are synthesized is called the ____.

A) plastid
B) vacuole
C) nucleoplasm
D) nucleolus
E) basal body

Nucleolus

In a cell nucleus, a dense, irregularly shaped region where ribosomal subunits are assembled.

Nucleoplasm

Of a nucleus, viscous fluid enclosed by the nuclear envelope.

Basal Body

A cellular structure that forms the base of a eukaryotic cilium or flagellum, acting as a template for its assembly and anchoring it to the cell.