Q. 30

Describe wi

Answer :

Fluid mosaic organisation: It was proposed in the early 1970s by S.J. Singer and G. Nicolson. According this model, plasma membrane is composed of a bilayer of phospholipids. There are two types of proteins-intrinsic and extrinsic are embedded in the lipid bilayer. These proteins are:

(i) Intrinsic proteins -They completely cover the lipid bilayer.’


(ii) Extrinsic proteins – These occur either on the outer surface or on the inner surface of lipid layer.


The “fluid” part of the term comes from the belief that the proteins are able to flow and move around in the membrane.

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