Describe the structure of mitochondria with special reference to its membrane covering.

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(N/A) $(i)$ Mitochondria are bounded by a double membrane structure.
$(ii)$ The outer membrane is porous and allows the passage of various molecules.
$(iii)$ The inner membrane is deeply folded into structures called cristae.
$(iv)$ These folds significantly increase the surface area for $ATP$ generating chemical reactions.

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