They all have the basic structure of a phospholipid bilayer.*The hydrophobic layer (fatty acid tails) form a barrier for the cell from the outside environment. This also helps to stop ions and molecules that aren’t needed from getting in.
In watery environments some membranes form a layer of oil; this is the ideal boundary for some living systems. The metabolic reactions within the cell can take place within the layer.
-
Light microscopes cannot be used to see the cell surface membrane in detail because of its lower resolution.
-
However an electron microscope can be used to see the cell surface membrane in greater detail.
-
The hydrophilic layers can be seen or appear as dark tram lines whereas the hydrophobic tails can be seen in the paler regions.
A membrane can vary in width but is usually 7- 10 nm. A cell surface membrane is 7.5 nm. Simple phospholipid bilayers are too FRAGILE and INCAPABLE of acting and functioning as a biological membrane, as they need other components to develop/ improve it. The specialisation of membranes are called differentiation.
Comments
No comments have yet been made