Which organelle is known as the "powerhouse of the cell"?

• A. Nucleus
• B. Ribosome
• C. Mitochondria
• D. Lysosome

Answer: (C)

The organelle known as the "powerhouse of the cell" is the mitochondria. This designation arises from its critical role in generating adenosine triphosphate (ATP), the primary energy currency of the cell, through the processes of cellular respiration. Mitochondria are involved in the oxidation of nutrients, converting chemical energy from food into ATP, thereby providing the energy required for various cellular activities.

Mitochondria possess their own DNA and are capable of replicating independently within the cell, which supports the endosymbiotic theory that suggests these organelles originated from free-living prokaryotes. The inner mitochondrial membrane contains proteins that facilitate the electron transport chain and ATP synthesis.

Other organelles serve essential functions but do not produce ATP. For example, the nucleus contains genetic material and is responsible for regulating gene expression, while ribosomes are involved in protein synthesis. Lysosomes, on the other hand, function as the cell’s waste disposal system, breaking down macromolecules and recycling cellular components. Thus, while these organelles have vital roles, none match the specific energy-producing function of mitochondria.