Lipids and Biomembranes

ID #1070

In lecture you stated that there was available space between the hydrophobic tails when they form a lipid bilayer. Is that space filled with cholesterol? If so why and if not what is it filled with then?

That space can in fact be filled with cholesterol in animal cell membranes, or it can just be the "territory" occupied by a given fatty acid tail. If I extend my arms and spin around rapidly in a circle, I occupy a certain radius of space don't I? But at any given instant in time, my arms are only found at a particular position -- the rest of that radius looks "empty".

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