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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.

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.

Option: 1

Part (C): Cristae - possess single circular DNA molecule and ribosomes


Option: 2

Part (A): Matrix - major site for respiratory chain enzymes


Option: 3

Part (D): Outer membrane - gives rise to inner membrane by splitting


Option: 4

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


Answers (1)

best_answer

The mitochondria is an oval shaped double membrane-bounded organelle. The outer membrane (D) is continuous while the inner membrane (B) folds to form finger-like projections called cristae. The folding of the inner membrane increases the surface area inside the organelle, the increased surface area creates more space for reactions to occur. The fluid contained in the mitochondria is called the matrix. It is the space enclosed by the inner membrane. It is important in the production of ATP with the aid of the ATP synthase contained in the inner membrane. 

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