interaction by an amphipathic α-helix parallel to the membrane plane (in-plane membrane helix) 2. Predominately interact with integral proteins Can attach by weak hydrogen bonds 1. PHOSPHATE HEADS – are water loving and point toward water FATTY ACID TAILS – are water fearing and orient themselves to each otherĢ0 INTEGRAL PROTEINS Proteins surrounded by phospholipids which go through the membrane Functions: serve as ion channels, membrane pumps, or receptorsĢ3 PERIPHERAL PROTEINS Proteins which attach to the membrane Liposome is a small vesicle, with an aqueous compartment surrounded by a bilayer In water, phospholipids form a bilayer A cell membrane is a bilayer Phospholipids are like triglycerides with a phosphate Come together to make a fluid membrane Proteins (intergral & peripheral) Carbohydrates (glucose)ġ2 PHOSPHOLIPIDS Make up 30-70% of the cell membrane Signal Transduction converts a mechanical/chemical stimulus to a cell into a specific cellular response.Įnzyme Activity Cells rely on thousands of different enzymes to catalyze metabolic reactions, many of these occur at the cell membrane.ġ1 MEMBRANE COMPONENTS Phospholipids Cholesterol Transport Regulates movement of substances in / out of cell (selectively permeable)Ĭell recognition Allows cells to identify surrounding cellsĬellular Attachment Cell membranes have junctions – surfaces which interlock keeps cells together – and surfaces which attach them to the extra cellular matrix. Protective barrier - contains cytoplasm (contents of the cell) Model says cell membrane is not solid, fluid. Presentation on theme: "FLUID MOSAIC MODEL."- Presentation transcript:Ģ FLUID MOSAIC MODEL Model describing structure of the cell membrane
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