Unit 1: Biochemistry -# 9 Role of Cholesterol

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4 Terms

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Cholesterol

  • Cholesterol is a sterols (steroid) that is found in the membrane of animal cells and influence membrane fluidity.

<ul><li><p><span>Cholesterol is a sterols (steroid) that is found in the membrane of animal cells and influence membrane fluidity.</span></p></li></ul><p></p>
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If temperature is High

  • Phospholipids move quickly and membrane may become too fluid

  • Cholesterol helps to restrain the movement of the lipid molecules in a membrane thus reducing the fluidity of the molecules

<ul><li><p>Phospholipids move quickly and membrane may become too fluid</p></li><li><p>Cholesterol helps to restrain the movement of the lipid molecules in a membrane thus reducing the fluidity of the molecules</p></li></ul><p></p>
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If Temperature is Low

  • Phospholipids become tightly packed and membrane may become a highly viscous semi-solid gel

  • Cholesterol occupies space between phospholipids

  • Keeps the oil bilayer flexible in cold temps - prevents fatty acids from associating and forming a non-fluid gel

<ul><li><p>Phospholipids become tightly packed and membrane may become a highly viscous semi-solid gel</p></li><li><p>Cholesterol occupies space between phospholipids</p></li><li><p>Keeps the oil bilayer flexible in cold temps - prevents fatty acids from associating and forming a non-fluid gel</p></li></ul><p></p>
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