BIOLOGY 172 Lecture Notes - Lecture 10: Nanometre, Phagocytosis, Fructose

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15 Oct 2016
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In cellular membranes, there is always a phosphate group and they"re referred to as phosphate lipids. Phosphate group attached to hydrocarbons (which are hydrophobic) The polar groups either interact with each other or with water molecules. Hydrophobic of a protein, membrane, of anything will want to interact with each other and not water. Hydrophilic will want to interact with water or each other. If you take a bunch of phospholipids, they will create a distinct circular/dome shape. Lipids are able to move laterally in the bilayer, called drifting. Rarely, once per month or so, the lipids can flip sides. Saturated fats have more hydrogen compared to unsaturated fats. The kinks in unsaturated fats lower the amount of interaction between the tails. Unsaturated fatty acid tails enhance the permeability of the membrane. Cholesterol provides a rigidity (it is hydrophobic) and links two lipids together, restricting their movement and lowering the fluidity. Cholesterol has to be present in the membrane.

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