What is the primary function of mitochondria?

• A. Protein synthesis
• B. Energy production through oxidative phosphorylation
• C. Cell division
• D. Storage of nutrients

Answer: (B)

Mitochondria are often referred to as the powerhouses of the cell because their primary function is energy production through oxidative phosphorylation. This process occurs in the inner mitochondrial membrane, where the electron transport chain generates a proton gradient. As protons flow back into the mitochondrial matrix through ATP synthase, ATP is produced from ADP and inorganic phosphate. This ATP serves as a crucial energy carrier within the cell, powering various cellular processes.

While protein synthesis occurs in the ribosomes, and cell division is primarily managed by the nucleus and cytoskeletal components, mitochondria can influence these processes by supplying the necessary energy. The storage of nutrients, on the other hand, is largely a function of other organelles like lysosomes and vacuoles. Thus, energy production through oxidative phosphorylation captures the essential role of mitochondria in cellular metabolism.