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The plasma membrane is the boundary between the cell and its environment. It regulates what enters and exits the cell. Cells must maintain an appropriate amount of molecules to function inside them. They must also have a way to keep things out or to allow things to enter.
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Answer:

encloses specific structures is the correct answer.

Explanation:

purpose of the plasma membrane

  • The plasma membrane surrounds the cell, and it acts as a boundary that separates the cell from the outside surrounding.
  • It is made up of a bilayer of phospholipid and it encloses specific structures (cytoplasm that includes specific organelles).
  • The function of the plasma membrane is to control the transfer of substances and protect the cell from the external environment.

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