What is a primary function of Mitochondria?

Mitochondria are often referred to as the "powerhouses" of the cell, as their primary function is to produce energy. They generate adenosine triphosphate (ATP), which is the main energy currency of the cell, through a process called cellular respiration. This process involves the conversion of biochemical energy from nutrients into ATP, which cells use to perform various functions necessary for life.

In addition to energy production, mitochondria also play roles in regulating various metabolic processes, apoptosis (programmed cell death), and maintaining cellular health through the production of reactive oxygen species (ROS) and calcium storage. However, their primary role remains centered on energy production, which is crucial for the functioning of all cellular activities.

The other options do not accurately represent the main function of mitochondria. While storage of nutrients and transport of proteins are essential processes in the cell, they are primarily managed by other organelles (like the endoplasmic reticulum and Golgi apparatus). Regulation of cell division is typically governed by different cellular mechanisms and structures, such as the nucleus and various regulatory proteins. Thus, the choice that highlights the energy-producing role of mitochondria is indeed the most appropriate.