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The Cell Surface Membrane
All membranes around and within cells have the same basic structure and are known as
plasma membranes.
The cell-surface membrane is the plasma membrane that surrounds cells and forms a
boundary between the cell cytoplasm and the environment.

It allows different conditions to be established inside…

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Phospholipids form a bilayer sheet.

They make up 75% of the lipid.

They are an important component of the cell surface membrane for the following reasons:

- One layer of phospholipids has its hydrophobic heads pointing inwards -
interacting with the water in the cell cytoplasm
- The…

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Glycolipids make up 5% of membrane lipids.

They occur on the external surface of the cell surface membrane and the carbohydrate
portion of the glycolipid extends into the intercellular space and is called a glycocalyx. These
are important cell to cell recognition.

A steroid which makes up 20%…

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The proteins of the cell surface membrane are arranged more randomly than the regular
pattern of phospholipids.

They are embedded in the phospholipid bilayer in two main ways:

Extrinsic proteins
Occur either on the surface of the bilayer or only partly embedded in it.

They never extend completely across…


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