What is the primary function of mitochondria?

What is the primary function of mitochondria?

• A. To generate ATP
• B. To store glycogen
• C. To synthesize proteins
• D. To detoxify the cell

Answer: (A)

Mitochondria generate ATP, the cell’s main energy currency, through aerobic respiration. In the inner membrane, electrons travel through the electron transport chain to create a proton gradient, and ATP synthase uses that gradient to convert ADP and inorganic phosphate into ATP. This pathway yields the most energy per glucose molecule when oxygen is available, making it the primary source of cellular energy. Glycogen storage happens in the cytoplasm as glycogen granules, not in mitochondria. Protein synthesis mostly occurs on ribosomes, particularly those on the rough endoplasmic reticulum, with mitochondria contributing only a small portion of their own proteins. Detoxification is primarily handled by peroxisomes and the smooth endoplasmic reticulum, not mitochondria. Mitochondria do participate in other roles like apoptosis and certain metabolic steps, but ATP production is their central job.

Mitochondria generate ATP, the cell’s main energy currency, through aerobic respiration. In the inner membrane, electrons travel through the electron transport chain to create a proton gradient, and ATP synthase uses that gradient to convert ADP and inorganic phosphate into ATP. This pathway yields the most energy per glucose molecule when oxygen is available, making it the primary source of cellular energy. Glycogen storage happens in the cytoplasm as glycogen granules, not in mitochondria. Protein synthesis mostly occurs on ribosomes, particularly those on the rough endoplasmic reticulum, with mitochondria contributing only a small portion of their own proteins. Detoxification is primarily handled by peroxisomes and the smooth endoplasmic reticulum, not mitochondria. Mitochondria do participate in other roles like apoptosis and certain metabolic steps, but ATP production is their central job.