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The figure below shows the structure of a mitochondrion with its four parts labelled (A), (B), (C) and (D). Select the part correctly matched with its function.

1. Part (D): Outer membrane - gives rise to inner membrane by splitting
2. Part (B): Inner membrane - forms infoldings called cristae
3. Part (C): Cristae - possess single circular DNA molecule and ribosomes
4. Part (A): Matrix - major site for respiratory chain enzymes

Correct answer: Part (B): Inner membrane - forms infoldings called cristae

Solution

The inner mitochondrial membrane is the one that folds inward to form cristae, increasing surface area for respiration. The other options misassign DNA, ribosomes, or respiratory enzymes to the wrong mitochondrial compartment.

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