A) \[N{{a}^{+}}\] and \[{{K}^{+}}\]ions move across cell membrane by passive transport
B) Proteins make up 60 to 70% of the cell membrane
C) Lipids are arranged in a bilayer with polar heads towards the inner part
D) Fluid mosaic model of cell membrane was proposed by Singer and Nicolson
Correct Answer: D
Solution :
In 1972, Singer and Nicolson proposed fluid mosaic model for internal structure of plasma membrane. This is most widely accepted model for plasma membrane. According to this model, a membrane consists of a continuous bilayer of phospholipid molecules in which globular proteins are embedded. The lipids are arranged in a bilayer with polar heads towards outerside.
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