Question

Which structure mainly maintains composition of mitochondrial matrix?

• A. Outer membrane
• B. Inner membrane
• C. Both A and B
• D. Both membrane and perimitochondria space

Answer 1

The correct option is B Inner membrane

The mitochondrial matrix is the ground substance enclosed by the inner membrane of the mitochondria. Inner membrane maintains the composition of the mitochondrial matrix. The inner membrane is freely permeable only to oxygen, carbon dioxide, and water. It is much less permeable to ions and small molecules than the outer membrane, creating compartments by separating the matrix from the cytosolic environment. The inner mitochondrial membrane is both an electrical insulator and chemical barrier.