What is the primary function of the mitochondrion in cellular respiration?

What is the primary function of the mitochondrion in cellular respiration?

• A. To synthesize proteins for ribosomes.
• B. To produce ATP via oxidative phosphorylation.
• C. To store genetic material.
• D. To package and export proteins.

Answer: (B)

The mitochondrion’s main job in cellular respiration is to generate ATP through oxidative phosphorylation. In this process, electrons are passed along the electron transport chain in the inner mitochondrial membrane, driven by NADH and FADH2. As electrons move, protons are pumped across the membrane, creating a proton gradient. ATP synthase then uses this gradient to drive the conversion of ADP and inorganic phosphate into ATP, a process called chemiosmosis. Oxygen acts as the final electron acceptor, forming water. The Krebs cycle provides the electron carriers that feed the chain, while glycolysis occurs in the cytoplasm; however, the bulk of ATP production happens inside the mitochondrion via oxidative phosphorylation. Other functions like protein synthesis, storing genetic material, or packaging/exporting proteins are handled by other cellular structures.

The mitochondrion’s main job in cellular respiration is to generate ATP through oxidative phosphorylation. In this process, electrons are passed along the electron transport chain in the inner mitochondrial membrane, driven by NADH and FADH2. As electrons move, protons are pumped across the membrane, creating a proton gradient. ATP synthase then uses this gradient to drive the conversion of ADP and inorganic phosphate into ATP, a process called chemiosmosis. Oxygen acts as the final electron acceptor, forming water. The Krebs cycle provides the electron carriers that feed the chain, while glycolysis occurs in the cytoplasm; however, the bulk of ATP production happens inside the mitochondrion via oxidative phosphorylation. Other functions like protein synthesis, storing genetic material, or packaging/exporting proteins are handled by other cellular structures.