cell membrane notes notebook pg. 56-57 textbook: chapter 3.3, 3.4, 3.5 pg.s 81-95
DESCRIPTION
I. CELL MEMBRANE B. Structure Semipermeable Lipid BilayerSemipermeable Lipid Bilayer Hydrophilic Phosphorus Heads – love waterHydrophilic Phosphorus Heads – love water Hydrophobic lipid tails – repel waterHydrophobic lipid tails – repel water E (exterior) face and P (protoplasmic) faceTRANSCRIPT
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CELL MEMBRANENOTES
Notebook Pg. 56-57
Textbook: Chapter 3.3, 3.4, 3.5Pg.s 81-95
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I. CELL MEMBRANEA. Purpose•Maintains homeostasis!•regulates the movement of dissolved molecules in and out of cell•Provides structure and Provides structure and supportsupport
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I. CELL MEMBRANEB. StructureB. Structure•Semipermeable Lipid BilayerSemipermeable Lipid Bilayer•Hydrophilic Phosphorus Heads – love waterHydrophilic Phosphorus Heads – love water•Hydrophobic lipid tails – repel waterHydrophobic lipid tails – repel water•E (exterior) face and P (protoplasmic) face
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The Fluid Mosaic Model
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THE FLUID MOSAIC MODEL
Fluid Mosiac Video
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• B. Structure B. Structure continuedcontinued…Write on membrane picture…Write on membrane picture
• ProteinsProteins– Integral – transport large materials in and outIntegral – transport large materials in and out– Peripheral - Many jobs including lipid digestion and signalingPeripheral - Many jobs including lipid digestion and signaling
• CarbohydratesCarbohydrates– Glycolipids - Glycolipids - provide energy and also serve as markers for cellular recognition.– Glycoproteins – involved in immunity to diseasesGlycoproteins – involved in immunity to diseases
• Cholesterol Cholesterol – maintains integrity of membrane, keeps it from turning – maintains integrity of membrane, keeps it from turning to mush.to mush.
• CytoskeletonCytoskeleton (on P Face) - (on P Face) - shape, support, and movement.
I. CELL MEMBRANE
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Other functions of membrane proteins
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II. TERMS TO KNOW• SOLUTION - a
mixture of two or more substances.
• SOLUTE – The particles in the solution
• SOLVENT – Dissolves the solute
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• CONCENTRATION– Refers to the
percentage of solutes in a solution.
II. TERMS TO KNOW
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EquilibriumIn a solution, particles move constantly, collide with one another, and tend to spread out randomly and evenly until they reach equilibrium.
II. TERMS TO KNOW
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III. PASSIVE TRANSPORT - No Energy is Required!
A. DIFFUSION• particles in a
solution move from high concentration to an area of low concentration until equilibrium is reached
Food Coloring Diffusion
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• B. OSMOSIS - specifically the diffusion of water
70%
100%
If the concentration of water inside was 70% and the concentration of water outside was 95%, what would happen to size of the cell?
III. PASSIVE TRANSPORT - No Energy is Required!
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Osmosis Further Explained100% Concentration(High)
0% Concentration(Low)
50% Concentration(Equilibrium)
50% Concentration(Equilibrium)
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`
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Is this really Osmosis???
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III. PASSIVE TRANSPORTNo Energy Required
• C. Facillitated Diffusion– Helps large molecules move
through the protein channels in membrane
– Depends on random particle movements
• No energy required
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IV. Active Transport• A. Protein Pumps
– Force large molecules to move in and out through protein pumps gainst a concentration gradient. (opposite direction)
– ATP Energy is required
https://Sodium Potassium Pump
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IV. Active Transport
• B. Endocytosis– Cell “eats” material by infolding the cell membrane with
vesicles• Phagocytosis - cell engulfs large food particles• Pinocytosis - cell takes in liquid
https://Amoeba Endocytosis
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IV. Active Transport• C. Exocytosis
– Cell releases large amounts of material
https://Paramecium Exocytosis
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V. TYPES OF SOLUTION• A. HYPERTONIC SOLUTION
“Hyper” = more
– Concentration of SOLUTES is MORE
– Water concentration is LESS
– Water flows out of cell– The cell shrivels and may
die - Plasmolysis
Paramecium in Salt Water
Plant Cells in Salt Water
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V. TYPES OF SOLUTION• HYPOTONIC
"HYPO" means less
• Concentration of solutes is LESS
• Water concentration is HIGH
• Water flows in • The cell swells with water,
becomes “turgid”, and dies - Cytolysis
Turgid Elodea cells
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• C. IsotonicIso = equal
• Concentration is the same inside and out
• No net movement• The cell stays the
same
V. TYPES OF SOLUTION
Osmosis Summary
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• Which fish is in a hypertonic solution?
• Which fish is in a hypotonic solution?
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• What would have happened to Nemo (a saltwater fish with 40% solute) if he was caputured by someone who didn’t know about osmosis and put him in a freshwater tank with 0% solute?
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