Give examples of  infoldings of cell membrane.

Cristae of mitochondria and mesosomes found in prokaryotes are some examples of the infoldings of the cell membrane.  

 

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What is the disadvantage of freely permeable membrane?

If the membrane is freely permeable, then any material outside would enter into the cell and cell cannot remain as a separate unit from environment. Because of this the cell will not be able to perform the life processes efficiently. 
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Describe evaginations of cell membrane with an example.

Evaginations are out foldings of cell membranes.

Example : Microvilli. These are the evaginations present on epithelial cells like those of ileum. They help to increase the surface area for exchange of materials and absorption.  

 

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Describe fluid mosaic model.

Fluid mosaic model was given by Singer and Nicholson. According to this theory the phospholipid molecules are arranged to form a continuous bimolecular layer of vlipid molecules. The two layers are arranged in such a way that the polar heads of the lipid molecules face the outside while the hydrophobic tails of the lipid are on the inner sides. esides lipids the cell membrane also has proteins, cholesterol and carbohydrates attached to it. 

 

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 What is diffusion ? Describe its importance in cell.


Diffusion. It is the passing of molecules from higher concentration to lower concentration. F

Importance of diffusion :

It helps in the transport of different materials in and ot of the cell. 

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