Membrane Fluidity
The plasma membrane is a fluid combination of phospholipids, cholesterol, and proteins. Carbohydrates attached to lipids (glycolipids) and to proteins (glycoproteins) extend from the outward-facing surface of the membrane.
Source
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"OpenStax College, Components and Structure. October 28, 2013."
http://cnx.org/content/m44416/latest/#fig-ch05_01_03
OpenStax CNX
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