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The plasma membrane is made up of Phospholipids and Proteins.
Phospholipids have a hydrophilic "head" and a hydrophobic "tail". They form into two layers each with the "head" pointing outwards and the "tail" inwards. This means that the hydrophobic "tail" does not have contact with water.
This enables;
lipid-soluble molecules to move into and out of the cell
prevent water-soluble molecules entering or leaving the cell
the membrane to be flexible
The proteins are arranged more randomly and and are embedded in the phospholipid bilayer in two ways:
Extrinsic proteins are on the surface and only partly embedded in it. They provide structural support or act as cell receptors
Intrinsic proteins occur across the plasma membrane and act as carriers to transport water-soluble molecules across the membrane. Some are enzymes.
These proteins provide;
support
a mechanism to transport water-soluble molecules across the membrane
a mechanism to allow active transport to take place by forming ion channels for sodium and potassium (to create the sodium-potassium pump)
The last point about allowing active transport to take place is probably the most important.
What else can I help you with?
What seperates a cell from the environment?
The cell membrane separates the cell from its environment.
What cell gives a plant shape and support?
?cell membrane?The cell wall.
What structure surrounds the cell membrane (in plants) and gives the cell support?
Cell Wall
What gives shape and support to the cells?
the cell membrane cellouse for plants support and chitin is whats in the cells of fungi and supports the mushrooms
Which part of the animal cell gives shape to the cell?
cell membrane The cells and organs surrounding it give the animal cell its shape. The membrane is totally flexible and confers no shape to the cell.
What seperates a cell from the environment?
The cell membrane separates the cell from its environment.
What cell gives a plant shape and support?
?cell membrane?The cell wall.
What structure surrounds the cell membrane (in plants) and gives the cell support?
Cell Wall
What structure surrounds the cell membrane in plants gives the cell support?
Cell Wall
What gives shape and support to the cells?
the cell membrane cellouse for plants support and chitin is whats in the cells of fungi and supports the mushrooms
What separates the contents of the cell from the surrounding the environment?
The cell membrane. And it also gives support to the cell.
What part of the cell gives support to the cell?
if its a plant cell its the cell wall..... if its an animal cell its the cell membrane
What part of the cell is the external protection and support for plants?
You are describing the cell wall surrounding the cell membrane.
Which part of the animal cell gives shape to the cell?
cell membrane The cells and organs surrounding it give the animal cell its shape. The membrane is totally flexible and confers no shape to the cell.
What do the cell membrane do in the plant cell?
the cell membrane gives the cell its shape.
Why does a cell with a cell wall need a membrane?
A cell that has a cell wall still needs a cell membrane because the two structures have different functions. A cell wall gives the cell shape, support and protection whereas a cell membrane controls what enters and leaves the cell. Also, the cell theory states that all cells have a cell membrane.
Why does a cell with a cell wall need a cell membrane?
A cell that has a cell wall still needs a cell membrane because the two structures have different functions. A cell wall gives the cell shape, support and protection whereas a cell membrane controls what enters and leaves the cell. Also, the cell theory states that all cells have a cell membrane.
