Which statement best describes the primary function of mitochondria in eukaryotic cells?

• A. They generate ATP by oxidizing fuels through the citric acid cycle and oxidative phosphorylation.
• B. They package and sort proteins for secretion via the endomembrane system.
• C. They synthesize proteins by translating mRNA on ribosomes in the cytosol.
• D. They store genetic information as linear chromosomes and control transcription for the cell.

Answer: (A)

Verified step by step guidance

1. Identify the main function of mitochondria by recalling their role in cellular metabolism and energy production.
2. Understand that mitochondria are known as the 'powerhouses' of the cell because they generate ATP, the cell's energy currency.
3. Recognize that ATP production in mitochondria occurs through the oxidation of fuel molecules, primarily via the citric acid cycle (Krebs cycle) and oxidative phosphorylation.
4. Compare this function with other organelles mentioned: protein packaging (Golgi apparatus), protein synthesis in the cytosol (ribosomes), and genetic information storage (nucleus).
5. Conclude that the statement describing mitochondria as generating ATP by oxidizing fuels through the citric acid cycle and oxidative phosphorylation best matches their primary function.