Describe the biological need for cells to be surrounded by a membrane that is selectively permeable for different materials

Every cell is surrounded by a cell membrane which is semi-permeable in nature. The need for cells to be surrounded by a semi-permeable membrane is to control the passage of material coming in and going out of the cell.

This membrane helps the cell to maintain a homeostatic condition inside the cell by allowing selective molecules to cross across the cell. The homeostatic condition is necessary for the proper functioning of the cell and cell survival.

Cell membrane is made up of lipid bilayer which contains membrane proteins embedded into it. Some proteins are freely movable in the cell membranes due to the fluid nature of the membrane.

These proteins are necessary for selective transport of substances across the membrane. These are also called transporter proteins.

the national environmental policy act (nepa) is a united states environmental law that promotes the enhancement of the environment and established the president's council on environmental quality (ceq). the law was enacted on january 1, 1970. to date, more than 100 nations around the world have enacted national environmental policies modeled after nepa.

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