Which organelle is known as the powerhouse of the cell?

Which organelle is known as the powerhouse of the cell?

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

Answer: (A)

Energy production in cells comes mainly from mitochondria, the organelles where most ATP is generated through cellular respiration. They break down nutrients through stages like the citric acid cycle and oxidative phosphorylation, using the inner membrane’s folds (cristae) to maximize the area for the electron transport chain and ATP synthase. The electrons move through the chain, pumping protons to create a gradient, and ATP synthase uses that gradient to synthesize ATP from ADP and inorganic phosphate. This sequence yields the bulk of the cell’s energy, which is why mitochondria are called the powerhouse. Other organelles have different roles—nuclei store and manage genetic information, ribosomes build proteins, and chloroplasts in plants capture light to drive energy-rich molecule production—but the primary energy-producing site in most cells is the mitochondrion.

Energy production in cells comes mainly from mitochondria, the organelles where most ATP is generated through cellular respiration. They break down nutrients through stages like the citric acid cycle and oxidative phosphorylation, using the inner membrane’s folds (cristae) to maximize the area for the electron transport chain and ATP synthase. The electrons move through the chain, pumping protons to create a gradient, and ATP synthase uses that gradient to synthesize ATP from ADP and inorganic phosphate. This sequence yields the bulk of the cell’s energy, which is why mitochondria are called the powerhouse. Other organelles have different roles—nuclei store and manage genetic information, ribosomes build proteins, and chloroplasts in plants capture light to drive energy-rich molecule production—but the primary energy-producing site in most cells is the mitochondrion.