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Transcript
Membrane Transport Pages 78-85 include information on membrane transport Cell Membrane aka Plasma Membrane • Composed of double layer of phospholipids and • • • proteins (A phospholipid bilayer) Surrounds outside of ALL cells Is semipermeable Watch This Outside of cell Proteins Carbohydrate chains Cell membrane Inside of cell (cytoplasm) Protein channel Lipid bilayer 2 Phospholipids • Heads contain glycerol & • • • phosphate and are hydrophilic (attract water) Tails are made of fatty acids and are hydrophobic (repel water) Make up a bilayer where tails point inward toward each other Can move laterally to allow small molecules (O2, CO2, & H2O to enter) copyright cmassengale 3 The Cell Membrane is Fluid FLUID MOSAIC MODEL: Molecules in cell membranes are constantly moving and changing 4 Cell Membrane Proteins • Proteins help move large • • molecules or aid in cell recognition Peripheral proteins are attached on the surface (inner or outer) Integral proteins are embedded completely through the membrane copyright cmassengale 5 GLYCOPROTEINS Recognize “self” Glycoproteins have carbohydrate tails to act as markers for cell recognition copyright cmassengale 6 Cell Membrane in Plants Cell membrane • Lies immediately against the cell wall in plant cells • Pushes out against the cell wall to maintain cell shape copyright cmassengale 7 Cell Membrane Forming Spontaneously?! Remember The Heterotroph Hypothesis? Two Forms Of Membrane Transport Concepts: Equilibrium Concentration gradients Polarity Molecule size Electrical Charge Passive vs. Active Passive Transport Passive transport requires no energy! Diffusion - Movement from [hi] to [low] Osmosis - Diffusion of water Facilitated Diffusion - with carrier proteins Active Transport Active transport requires energy Ion Channels Ion Pumps Endocytosis Phagocytosis Pinocytosis Exocytosis