Question

1
9. Plasma membrane is made up of
(a) A protein layer between two lipid layers
(b) A lipid layer between two protein layers
(c) A protein, a lipid and a cellulose layer
(d) Bimolecular lipid layer surrounded b
protein layers
​

Answer 1

A protein, a lipid and a cellulose layer

Answer 2

Plasma membrane comprises of bimolecular lipid layer surrounded by protein layers. (option d)

• The plasma membrane is a flexible outermost covering of animal cells and the second covering after cell wall in plant cells and prokaryotes.
• The general structure of the membrane is given by the phospholipid bilayer theory which shows two layers of phospholipids containing a hydrophilic head and a hydrophobic tail.
• The bilayer is studded with proteins whose major role is transport of material across the membrane.
• These membrane proteins may be peripheral on one side of the membrane or integrated across the bilayer.