Which statement best describes the mitochondrion's role in the cell?

Which statement best describes the mitochondrion's role in the cell?

• A. Powerhouse of the cell; generates ATP
• B. Synthesize ribosomal RNA
• C. Store genetic material
• D. Digest cellular waste

Answer: (A)

The mitochondrion’s main role is to generate ATP, the cell’s energy currency, through aerobic respiration. It takes energy from nutrients and converts it into ATP via a series of steps: pyruvate from glycolysis enters the mitochondrion and is used in the citric acid cycle, which produces electron carriers that feed the electron transport chain. The chain uses that energy to pump protons across the inner membrane, creating a gradient that drives ATP synthase to produce ATP. The inner membrane’s folds, called cristae, increase surface area to make this process efficient. While mitochondria do contain some DNA, their primary function is energy production, unlike ribosomal RNA synthesis in the nucleus, storage of genetic material mainly in the nucleus, or waste digestion by lysosomes.

The mitochondrion’s main role is to generate ATP, the cell’s energy currency, through aerobic respiration. It takes energy from nutrients and converts it into ATP via a series of steps: pyruvate from glycolysis enters the mitochondrion and is used in the citric acid cycle, which produces electron carriers that feed the electron transport chain. The chain uses that energy to pump protons across the inner membrane, creating a gradient that drives ATP synthase to produce ATP. The inner membrane’s folds, called cristae, increase surface area to make this process efficient. While mitochondria do contain some DNA, their primary function is energy production, unlike ribosomal RNA synthesis in the nucleus, storage of genetic material mainly in the nucleus, or waste digestion by lysosomes.