According to the 'unit membrane model,' the thickness of the cell membrane is about
7.5 nm
200 nm
150 nm
1.0 nm
A
200 nm
B
150 nm
C
1.0 nm
D
7.5 nm
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Solution
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Unit membrane model was given by Robertson in 1959. According to this concept, plasma membrane has a trilaminate structure with an electron transparent lipid bilayer 35 ˚A thick lying sandwiched between electron dense protein layers 20 ˚A thick each. Thus, the total thickness of membrane will be 75 ˚A or 7.5 nm.
So, the correct answer is '7.5 nm'
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