Where are the complexes of the electron transport chain located?

• A. In the outer mitochondrial membrane
• B. In the cytoplasm
• C. In the mitochondrial matrix
• D. In the inner mitochondrial membrane

Answer: (D)

Verified step by step guidance

1. Understand the structure of the mitochondrion: The mitochondrion has several compartments, including the outer membrane, inner membrane, intermembrane space, and the matrix.
2. Learn about the electron transport chain (ETC): The ETC is a series of protein complexes and other molecules that transfer electrons through a membrane within mitochondria to form a gradient of protons that drives the synthesis of ATP.
3. Identify the location of the ETC: The complexes of the electron transport chain are embedded in the inner mitochondrial membrane. This location is crucial for the function of the ETC as it allows the creation of a proton gradient across the membrane.
4. Explore the function of the inner mitochondrial membrane: The inner membrane is impermeable to ions, which is essential for maintaining the proton gradient necessary for ATP synthesis.
5. Review the role of the mitochondrial matrix: While the matrix is involved in other metabolic processes, such as the citric acid cycle, the electron transport chain complexes are not located here.