The cell is the basic unit of structure and function. It contains many organelles, each with various tasks and duties. There are two types of cells: prokaryotic and eukaryotic.
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Cell membranes are very important structures to cells because they function as a barrier between the components of the cell and the outside environment. The cell membrane is not only responsible for creating a wall between inside and outside the cell, it must also act as a threshold through which select molecules can enter and exit the cell when necessary.
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