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Q. Unit membrane consists of

Chhattisgarh PMTChhattisgarh PMT 2005

Solution:

Robertson $(1959)$ was first proposed the concept of unit membrane model. According to Robertson, the unit membrane consists of a bimolecular lipid leaflet sandwiched between outer and inner layers of protein, organized in the pleated sheet configuration, Protein-phospholipid -phospholipid - protien.
Each unit membrane is $ 75\,\mathring{A}(65-85\,\mathring{A})$ thick. Such an arrangement was presumed to be basically the same in all cell membranes.