The main difference between the nucleus and nucleolus is that the nucleus is the most important cell organelle that keeps the eukaryotic cell's genetic material. In contrast, the nucleus is a sub organelle situated inside of the nucleus, which contains RNA. The cell is the main component of all dwelling organisms, and the nucleus is a membrane-bound organelle that appears in almost every eukaryotic cell except some cells, such as red blood cells.
The nucleus is the largest organelle in animal cells. It is mostly round-shaped. The composition in the nuclear membrane is similar to the structure of the plasma membrane. The nucleolus is situated in the nucleus and is a highly complex area. There are also various areas in the nucleus. It is a sub organelle that is non-membranous.
It is composed of DNA units that are responsible for coding rRNA for ribosome production. The primary purpose is to integrate rRNA and generate ribosomes. It carries out ribosome biogenesis. The nucleus aims to control cellular activities and regulate gene expression, while the nucleolus's primary function is to produce ribosomes. The nucleus is mainly responsible for making mRNA, while the nucleolus is primarily responsible for making rRNA.