The nucleus is the most important organelle as it functions as the control center of the cell. It stores the organism's DNA and regulates critical cell activities like growth, reproduction, and protein synthesis. The nucleus contains the cell's chromosomes and controls the cell's genetic information and heredity traits through pores that allow molecules to pass in and out. Its major functions are to control the cell's genetic information, protein synthesis, cell division and growth, and store DNA, RNA, and ribosomes.

1. The most important cell organelle is NUCLEUS because nucleus is a crucial
organelle that functions as the control center of ‘leader’ of the cell. The nucleus
performs two critical functions; it stores the organism’s instruction manual in the
form of DNA and regulates the cell’s activities including growth, reproduction,
communication, gene expression and protein synthesis.
A nucleus is a membrane-bound organelle that contains the cell’s
chromosomes. Pores in the nuclear membrane allow for the passage of
molecules in and out of the nucleus. The main function of the nucleus is to
controls and regulates the activities of the cell (e.g. growth and metabolism)
and carries the genes, structures that contain the hereditary information.
The 4 major functions of the nucleus is;
 Control of the genetical information of the cell and thus the heredity
characteristic of an organism.
 Control of the protein and enzyme synthesis.

2.  Control of cell division and cell growth.
 Storage of DNA, RNA, and ribosome.
 Regulation of the transcription of the mRNA to protein