Which is NOT a function of the nucleus?

The nucleus plays a crucial role in cellular function, serving several important functions, but it does not produce most of the cell's ATP. The primary role of the nucleus is to store and manage genetic information, which is essential for directing the activities of the cell.

The regulation of cellular activities is primarily achieved through the expression of genes stored within the nucleus, dictating which proteins are synthesized, when, and in what quantities. Protein synthesis is initiated in the nucleus as well, where messenger RNA (mRNA) is transcribed from DNA. This mRNA then exits the nucleus and serves as a template for protein synthesis in the cytoplasm.

ATP, or adenosine triphosphate, is primarily produced in the mitochondria, not in the nucleus. Mitochondria are the organelles responsible for converting biochemical energy from nutrients into ATP through processes such as oxidative phosphorylation and the Krebs cycle, making them the powerhouse of the cell. Thus, stating that producing most of the cell's ATP is a function of the nucleus is inaccurate.