Question

level 4 q2 where in the mitochondria does the electron transport chain occur? a. cytosol b. matrix c. inner membrane d. outer membrane

Explanation:

To solve this, we analyze each option:

• Option A: Cytosol is the fluid in the cytoplasm of a cell, not part of the mitochondria, so A is incorrect.
• Option B: The matrix of the mitochondria is where the citric acid cycle occurs, not the electron transport chain, so B is incorrect.
• Option C: The electron transport chain (ETC) occurs in the inner mitochondrial membrane. The inner membrane has protein complexes involved in ETC and ATP synthesis, so C is correct.
• Option D: The outer mitochondrial membrane is more permeable and not the site of ETC, so D is incorrect.

Answer:

C. Inner membrane