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The fluid mosaic model
The phospholipids form 75% of the cell surface membrane. This is about 7nm thick.


Singer and Nicholson proposed their `fluid mosaic' theory in 1972 to describe the structure
of the cell membrane. It's called a fluid mosaic model because:


1. The molecules move or sway within…

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greater rigidity greater fluidity

number of
more saturated fatty more unsaturated fatty
saturated fatty
acids acids. C=C
acids

length of fatty acid
longer fatty acid tails shorter fatty acid tails
tails

number of steroid
more cholesterol less cholesterol
(cholesterol
molecules molecules
molecules)


temperature cooler temperatures hotter temperatures

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