Which organelle converts glucose into ATP during cellular respiration to provide energy?

Which organelle converts glucose into ATP during cellular respiration to provide energy?

• A. Mitochondria
• B. Chloroplast
• C. Golgi Apparatus
• D. Endoplasmic Reticulum

Answer: (A)

Mitochondria are the primary site where ATP is produced during cellular respiration. Glucose is first broken down in the cytoplasm through glycolysis to form pyruvate, which enters mitochondria and is converted to acetyl-CoA. This feeds the citric acid cycle, generating NADH and FADH2. These electron carriers power the electron transport chain in the inner mitochondrial membrane; as electrons move through the chain, a proton gradient is created. ATP synthase uses that gradient to convert ADP into ATP, providing the cell with usable energy. The other organelles listed play different roles—chloroplasts are involved in photosynthesis and can produce ATP there, while the Golgi apparatus and endoplasmic reticulum handle protein and lipid processing and trafficking rather than ATP production.

Mitochondria are the primary site where ATP is produced during cellular respiration. Glucose is first broken down in the cytoplasm through glycolysis to form pyruvate, which enters mitochondria and is converted to acetyl-CoA. This feeds the citric acid cycle, generating NADH and FADH2. These electron carriers power the electron transport chain in the inner mitochondrial membrane; as electrons move through the chain, a proton gradient is created. ATP synthase uses that gradient to convert ADP into ATP, providing the cell with usable energy. The other organelles listed play different roles—chloroplasts are involved in photosynthesis and can produce ATP there, while the Golgi apparatus and endoplasmic reticulum handle protein and lipid processing and trafficking rather than ATP production.