Which organelle is primarily responsible for ATP production in cellular respiration?

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Multiple Choice

Which organelle is primarily responsible for ATP production in cellular respiration?

The organelle that generates most of the cell’s ATP during cellular respiration is the mitochondrion. Inside the mitochondrion, the Krebs cycle runs in the matrix to provide high-energy electron carriers, and the electron transport chain sits in the inner membrane. As electrons are transferred through the chain, protons are pumped across the membrane, creating a proton gradient. ATP synthase uses this gradient to convert ADP into ATP. This is where the bulk of ATP is produced under aerobic conditions. The nucleus stores genetic information, the endoplasmic reticulum handles synthesis and transport of proteins and lipids, and the Golgi apparatus further modifies and ships proteins—none primarily generate ATP.

The organelle that generates most of the cell’s ATP during cellular respiration is the mitochondrion. Inside the mitochondrion, the Krebs cycle runs in the matrix to provide high-energy electron carriers, and the electron transport chain sits in the inner membrane. As electrons are transferred through the chain, protons are pumped across the membrane, creating a proton gradient. ATP synthase uses this gradient to convert ADP into ATP. This is where the bulk of ATP is produced under aerobic conditions. The nucleus stores genetic information, the endoplasmic reticulum handles synthesis and transport of proteins and lipids, and the Golgi apparatus further modifies and ships proteins—none primarily generate ATP.

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