Plasma Membranes

AP Biology· difficulty 3/5

The fluid mosaic model emphasizes that membrane proteins:

A
$Spontaneously flip from one leaflet to the other quickly$
B
$Are covalently fixed in position by the cytoskeleton$
C
$Span only one leaflet of the bilayer$
D
$Move laterally within the lipid bilayer like floating mosaic tiles$
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Explanation

The model views the membrane as a 2D fluid in which proteins drift laterally; this lateral mobility is essential for signaling, transport, and membrane fusion.

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