What functions does the nucleus perform in a eukaryotic cell?

The nucleus serves as the information center of the eukaryotic cell, performing several critical functions to maintain cellular life and activity:

• Genetic Storage and Protection: The nucleus houses and protects the cell’s DNA, which is organized into chromosomes via chromatin packaging. This ensures that genetic information is preserved and accurately replicated during cell division.123
• Regulation of Gene Expression: It controls cellular activities by determining which genes are activated. The nucleus transcribes DNA into messenger RNA (mRNA), regulating the amount and type of proteins synthesized by the cell.12
• RNA Synthesis and Processing: Beyond mRNA, the nucleus synthesizes other essential RNA classes, including transfer RNA (tRNA) and ribosomal RNA (rRNA).42
• Ribosome Biogenesis: Within the nucleus, a specialized structure called the nucleolus synthesizes rRNA and assembles ribosome subunits, which are then exported to the cytoplasm for final assembly.54
• Selective Transport: The nuclear envelope uses nuclear pore complexes to regulate the movement of molecules, such as proteins and RNA, between the nucleus and the cytoplasm.6