Lipid is the organic compound that makes up the major portion of the cell membrane.
What is a cell membrane?
- It is a membrane that separates the interior environment of a cell from the exterior environment.
- It is selectively permeable
- It is composed of a lipid bilayer.
- Proteins are embedded in it and can be either integral or peripheral.
Can all molecules cross the plasma membrane?
- No, all molecules cannot cross the plasma membrane.
- Small nonpolar molecules or small and charge polar molecules are the substances that can cross it.
- For transport of other substances facilitated diffusion and special proteins are present
What are some of the functions of plasma membrane?
Plasma membrane has two main function:
- They keep the unwanted and harmful substances out the cell.
- They have certain channels and proteins that allow specific molecules to enter the cell.
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