Fluidity of bio-membranes can be shown by

Fluidity of a membrane increases as the percentage of unsaturated fatty acids in the phospholipids goes up.

Fluidity of cell membranes in cold weather is maintained by

Assertion : Fluidity of plasma membrane is due to presence of phospholipids. Reason: Fatty acids of the phospholipids have kinks which do not allow the packing of molecules.

Fluidity is maximum in

Structure of cell membrane can be observed through-

Basement membrane can not be seen in :