Flexibility - (nonpolar regions are embedded within the...

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Flexibility The fatty acid tails are flexible, causing the lipid bilayer to be fluid. This makes the cells flexible. At body temperature, membranes are a liquid with a consistency that is similar to cooking oil. Cholesterol In animals, cholesterol is a major membrane lipid. It may be equal in amount to phospholipids. It is similar to phospholipids in that it one end is hydrophilic , the other end is hydrophobic . Cholesterol makes the membrane less permeable to most biological molecules. Proteins Embedded in the Membrane Proteins are scattered throughout the membrane. They may be attached to inner surface, embedded in the bilayer, or attached to the outer surface. Hydrophilic (polar) regions of the protein project from the inner or outer surface. Hydrophobic
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Unformatted text preview: (nonpolar) regions are embedded within the membrane. Membrane proteins are capable of lateral movement. Diffusion Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration. The movement is due to collisions, which occur more frequently in areas of higher concentration. The dots on the diagram above represent molecules or ions. After a period of time, the particles becoming dispersed (below). Overall, the movement is from the area of initial high concentration to areas that have a lower concentration....
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Flexibility - (nonpolar regions are embedded within the...

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