Cell Membranes Diffrent sections of cell membranes. 2.5 / 5 based on 2 ratings ? BiologyCellular processes and structureASAll boards Created by: Katie BrothertonCreated on: 21-11-11 21:44 Lipids Include waxes, sterols, fats and oils. Fats are chemically triglycerides. 1 of 9 Fats Saturated: Hard animal fats which are linked with heart disease. They are a chain of carbons molecules saturated with hydrogen. Polyunsaturated: Vegetable fats/oils which are not linked with heart disease. Contain lots of double bond carbons. C=C. 2 of 9 Triglyceride Made up of glycerol head joined to three fatty acids. Made via condensation reaction between glycerol and a fatty acid meaning on molecule of water is removed (one molecule of water per fatty acid). 3 of 9 Phospholipid One fatty acid on a triglyceride is replaced with a phosphate. The phosphate changes the properties of the glycerol head. Making it soluble in water Hydrophilic. The two remaining fatty acid tails are insoluble in water Hydrophobic. 4 of 9 Fluid mosaic Mosaic: The proteins are embedded in the phospholipid bi-layer. Fluid: The proteins can make sideways movements in the phospholipid bi-layer. Protein functions: Movement of materials across a membrane, active transport and facilitated diffusion. 5 of 9 Facilitated diffusion Movement down a concentration gradient. Requires protein carriers in channels in the membrane. Doesn't require energy in the form of ATP. It's specific, the proteins are shaped to carry only one type of molecule. 6 of 9 Osmosis Movement of water through a partially permeable membrane. The movement of water from a higher water potential to a lower water potential. 7 of 9 Active transport Movements of molecules against a concentration gradient. Requires protein carriers in the membrane. Requires energy from respiration in the form of ATP. 8 of 9 Water potential The ability of water to loose water Pure water has a water potential of 0. As you add solute the water potential becomes more negative. 9 of 9
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