It is important because, if the cell membrane was not selectivly permable, we would not be able to do the things today.
It makes it harder for viruses and free radicals to reach the nucleus.
the chemical nature of the membrane
its selectivly permeable which means it lets certain materials enter and leave the cell
it is not call ed the outer membrane, its the cell wall. It does the same thing like the cell membrane, but the cell wall is much for stricter with objects coming in and out of cell, what is call, selectivly permeable
active transport
A cell's membrane is made up of a phospholipid bilayer which has several protein channels and various other transport mechanisms built in.
The cell membrane is the most important in maintaining homeostasis. This is because the cell membrane controls what goes in and out of the cell.
It is just a way of keeping some thing out while allowing others to come into the cell. The cell can be destroyed by some things and not by others. It is something like a window screen which allows air to move in and out but keeps out bugs, some of which can be dangerous.
A cell membrane is found on both plant and animal cells it selectively chooses what substances may enter or leave the cell. Hence the term selectively permeable. For a more advanced explanation I recommend you research protein icebergs and the different types of transport a membrane can take part in. Example active transport
The cell membrane is selectively premeable. It regulates what comes and goes from the cell. Homeostasis- The ability of living things to maintain steady state of operation the membrane helps in this activity. -Ally :D
The fat on the out side
It's the plasma membrane. This is because it acts like a gate regulating what can enter and leave the cell. If the plasma membrane did not exist the cell would die because it might take in something that could kill it.