What are permeases ?

These are specific proteins for the exchange of substances across the plasma membrane.
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What are inter-cellular bridges ?

Inter-cellular bridges are slender strands of cytoplasm that project from the surface of the cells and helps in connecting adjacent cells.
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What is sodium-potassium exchange pump?

Na+/K+ is a active tranport pump which involves the inflow of Na+ and outflow of K+ or vice versa through membrane of cell. It is an energy dependent process which utilizes ATP for the production of energy. 
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What is quasifluid ?


The quasi-fluid nature of the lipid in the plasma membrane allows lateral movement of proteins within the overall bilayer of the membrane. 
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 What is active transportation ?

Active transport is the transportation of molecules or ions against their concentration gradient that is from lower to the higher concentration. The process is energy dependent in which ATP is utilised. For example Na+/K+ Pump.
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