Both the membranes of mitochondrion are

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(B) The mitochondrion is a double membrane-bound organelle found in most eukaryotic cells. It consists of an outer and an inner membrane,both composed

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structurally as well as functionally different.

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(B) The mitochondrion is a double membrane-bound organelle found in most eukaryotic cells. It consists of an outer and an inner membrane,both composed of phospholipid bilayers and proteins. The two membranes possess distinct structural and functional properties. The outer membrane is smooth and contains porins,making it permeable to small molecules. The inner membrane is highly folded into structures called cristae,which increase the surface area for biochemical reactions like the electron transport chain and $ATP$ synthesis. Due to these differences in composition and specialized roles,the membranes are considered structurally as well as functionally different.

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