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

• A. They package and modify proteins and lipids for transport to the plasma membrane and lysosomes.
• B. They store genetic information as the cell’s main repository of chromosomal DNA and control transcription.
• C. They generate most cellular ATP through aerobic respiration, including the citric acid cycle and oxidative phosphorylation.
• D. They synthesize proteins for secretion by translating mRNA on bound ribosomes.

Answer: (C)

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 main energy currency.
3. Recall the processes that occur in mitochondria, such as the citric acid cycle (Krebs cycle) and oxidative phosphorylation, which are key steps in aerobic respiration.
4. Compare the given options to the known functions of mitochondria: protein packaging is done by the Golgi apparatus, genetic information storage is the nucleus's role, and protein synthesis for secretion involves ribosomes and the endoplasmic reticulum.
5. Conclude that the statement describing mitochondria as generating most cellular ATP through aerobic respiration, including the citric acid cycle and oxidative phosphorylation, best describes their primary function.