2 Cell Membrane Fluid Mosaic Model Cell membrane is thought to be both fluid and a mosaic of phospholipids proteins and carbohydrates Fluid material is capable of flowing changing shape and shifting ID: 1042749
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1. Bell Ringer____H2O____Na2+
2. Cell Membrane
3. Fluid Mosaic Model Cell membrane is thought to be both fluid and a mosaic of phospholipids, proteins and carbohydrates. Fluid material is capable of flowing, changing shape, and shiftingMosaic small parts; together form a picturehttps://www.youtube.com/watch?v=LKN5sq5dtW4
4. What is special about FMM?Accounts for movement of molecules across the membrane
5. Cell Membrane PlayersPhospholipids Transport proteinsCarrier proteinsChannel proteins (aka. ion channel)Receptor proteins Marker proteins Cholesterol
6. 1. PhospholipidsConsists of:Phosphate group (polar head)Glycerol BackboneTwo fatty acids (nonpolar tail)
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8. All Proteins Molecule must fit inside protein in order to permeate the membrane 1. Transport proteins 2. Receptor proteins 3. Marker proteins How are these proteins similar to enzymes?How are these proteins different from enzymes?
9. 1.Transport Proteins a. Carrier proteinsFunction- move MOLECULES across a membrane Ex. hemoglobin, glucose transporterb. Channel proteinsFunction-move IONS across the membrane Ex. Potassium channel move molecules or ions across a membrane DOWN their concentration gradient.
10. a. Carrier ProteinsExample 1: hemoglobin transfers O2
11. a. Carrier ProteinExample 2: Glucose Transporter transports sugar
12. b. Channel Protein K+K+K+K+K+K+K+K+Potassium ions are flowing DOWN their concentration gradient
13. Passive Transport (3)Simple Diffusion Molecules move from a high to low concentrationOsmosisMovement of water from high to low concentration Facilitated diffusion Movement of molecules and ions from a high to low concentration with the help of: Transport proteins- carrier proteins and channel proteinshttp://highered.mheducation.com/sites/9834092339/student_view0/chapter5/how_facilitated_diffusion_works.html
14. 2. Receptor Proteins Receptor Proteins- bind to a specific signal molecule, enabling the cell to respondFunction- cell to cell communication to perform action Example: rhodopsin detects light, enabling you to see in dim- light conditions.
15. 3. Marker Proteins Marker Proteins- distinguish cell type; “tags” itFunction: helps cells identify other cellsExample: MHC class I and II
16. Cholesterol Cholesterol- type of fatty acid present in the cell membrane of all cells Function: building block to make hormones, vitamin D and other substances that help you absorb nutrients from food you eat.
17. Lipoproteins: carry cholesterol throughout bodyHDL- High Density LipoproteinsAKA “good cholesterol”Carries cholesterol back to liver to remove it. For You Information (NOT ON TEST)LDL- Low Density Lipoproteins AKA “bad cholesterol”High levels of LDL means cholesterol builds up in arteries, making heart work harder than it needs to.
18. Animations For all cell membrane activities… visit the following website: http://www.town.hull.ma.us/public_documents/hullma_highschclass/Blair/Cell%20Membrane DiffusionOsmosisPassive Transport Facilitated DiffusionActive Transport