The plasma membrane acts as a selective barrier, controlling the movement of substances in and out of the cell.
The plasma membrane is a phospholipid bilayer with embedded proteins that separates the internal contents of the cell from its surrounding environment. It controls the passage of organic molecules, ions, water, and oxygen into and out of the cell, playing a crucial role in maintaining cell homeostasis. Water, for example, can move across the membrane through osmosis.
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Answer:
c) It controls which substances enter and exit the cell
Explanation:
The plasma membrane is responsible for the selection of particles that enter and leave the cell in a selective process. It is composed of a bilayer of phospholipids and proteins that allow the passage of certain molecules respecting a concentration gradient and the necessities of the cell.
It is important to remember that phospholipids are composed of an hydrophilic head and a hydrophobic body and that the composition of the plasma membrane allows for a fluid movement and organization of the membrane in a fluid mosaic.
When the concentration gradient is not respected, and is necessary to go against it, the plasma membrane uses of a machinery of proteins and molecules to create the so called active transport where molecules are carried in or out of the cell against a concentration gradient or to carry big molecules into the cell or out of the cell.
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