Nucleolus

**The nucleolus** is a compact round organelle of the nucleus located inside it in prokaryotes and between the genetic material of the nucleus in the center of the cell in eukaryotes. Nuclei are often called the hearts of cells, because there is simply no nucleolus without a heart. In microorganisms, the presence of a nucleolus in the cell is due to the fact that it is the site of rRNA formation. The nucleolus contains RNA polymerase, as well as a large number of enzymes and RNA. It is important to note that even in different species of bacteria that normally lack a nucleus, nucleoli are retained. In higher organisms they remain in cells as rudiments of the nucleus.

Nucleoli perform different functions in the cell: + **Form chromosomes** - Formation of centrosomes. “Constructor of nuclear structures” is an integral function of nucleoli, since they are directly related to the formation of centromeric structures and, accordingly, the nuclear spindle, which functions as follows. The centromere, as mentioned above, has the shape of a ring. It is covered by the nucleolus. During the replication of dividing baby chromatids, consisting of two alternating DNA strands, a molecule is synthesized on them