What serves as the control center of the cell?

The nucleus serves as the control center of the cell because it houses the cell's genetic material (DNA) and is responsible for regulating gene expression and maintaining the integrity of genetic information. It is the site where transcription of DNA into RNA occurs, which is a crucial step in the synthesis of proteins. By controlling the production of RNA and proteins, the nucleus plays a pivotal role in managing the functions and activities of the cell, including growth, metabolism, and replication.

In contrast, the cell membrane functions as a protective barrier that regulates what enters and exits the cell but does not control cell activities. Ribosomes are essential for protein synthesis, translating mRNA into proteins but do not control cellular processes. Mitochondria are known as the powerhouse of the cell, generating energy in the form of ATP, but they do not serve as the control center. Therefore, the nucleus is distinctly identified as the central command hub of cellular functions.