Where does the Electron Transport Chain take place?

Where does the Electron Transport Chain take place?

• A. Matrix of the mitochondria
• B. Cristae of the mitochondria
• C. Cytoplasm
• D. Outer mitochondrial membrane

Answer: (B)

The electron transport chain functions in the inner mitochondrial membrane, specifically along the folds called cristae. These large surface areas host the protein complexes I–IV and ATP synthase, where electrons are transferred and protons are pumped to create the proton gradient used to make ATP. The matrix is where the citric acid cycle takes place to supply NADH and FADH2, while the cytoplasm carries out glycolysis and the outer mitochondrial membrane isn’t where the chain resides. So, the correct location is the cristae, the inner membrane of the mitochondria.

The electron transport chain functions in the inner mitochondrial membrane, specifically along the folds called cristae. These large surface areas host the protein complexes I–IV and ATP synthase, where electrons are transferred and protons are pumped to create the proton gradient used to make ATP. The matrix is where the citric acid cycle takes place to supply NADH and FADH2, while the cytoplasm carries out glycolysis and the outer mitochondrial membrane isn’t where the chain resides. So, the correct location is the cristae, the inner membrane of the mitochondria.