Cell Structure and Compartments
The highly folded membranes found in such eukaryotic organelles as mitochondria and chloroplasts

increase the surface area where key chemical processes can occur
make it possible to package large amounts of DNA within the cell
assist with cell movement
help the cell against physical damage

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Cell Structure and Compartments
According to the fluid mosaic model of cell membranes,

basic membrane structure results from how the proteins interact with water
the membrane is a highly mobile mixture of phospholipids and proteins
the most common type of molecules in the membrane are proteins
the unique properties of cell types are determined by their phospholipids

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