Ultra structure of the cell membrane:

 Figure: Two faces of bio membrane

Cell membranes are around 75A⁰ thick. Under electron microscope they come out to consist of three layers:

1. An outer electron dense layer of around 20A^o thick.

2. An inner electron dense layer of around 20A^o thick.

3. A middle pale colored layer of around 35A^o thick.

The outer and inner layers are built up of protein molecules while the middle one is composed of two layers of phospho lipid molecules. Such a trilaminar structure is termed as “Unit membrane” that is a fundamental concept of all membranes.

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