Cell Membrane Notes PDF

Notes: Cell Membrane Cell Membrane aka: " " Tuesday, October 12, 2021 5:16 PM Super Important for:...

Notes: Cell Membrane Cell Membrane aka: " " Tuesday, October 12, 2021 5:16 PM Super Important for: Cell Membrane *in ALL cells Video 1 - Fluid Mosaic Model I. Structure of Cell Membrane Fluid Mosaic Model: the molecules in the cell membrane are not "fixed", but are free to flow among each other like a ___________________. 3 Basic Molecules in Membrane: 1. __________________________ 2. __________________________ 3. __________________________ Structure of the Cell Membrane (loosely attached) (stuck in) Video 2 - 1. Phospholipid Bilayer: 2 layers of ________________________ "Selectively Permeable" Only _______________ molecules are Philic= able to ____________ __________ membrane. Hydro= semipermeable Phobic= "YES" ___________ "NO" ___________ ___________ ___________ Examples: Examples: -oxygen amino acids (build proteins) *cells need these, but can't -carbon dioxide carbohydrates (glucose) pass through directly. 2. Surface Proteins-can be used to: 1. transport(Transport Proteins/Ion Channels) -water* ions 2. bind/attach(Anchor Proteins) 3. receive signals(Receptor Proteins w/binding pockets for signaling molecule) 4. catalyze reactions(Enzymes) *Water is small but polar, so diffuses 5. identify/mark(Glycoproteins w/sugar "nametags") *Also glycolipids slowly…problem, needs extra ______________________________________________ __________________________________(aquaporins) Types of Proteins: Example: blood type ____________ proteins: permanently stuck in membrane (transmembrane pass all the way through) ____________ proteins: only adhere to one side of membrane. 3. Cholesterol: keep membrane from becoming too ______________ or too _________. --Increases both stability and movement. Type of lipid II. Movement Across the Cell Membrane Happens by: 1. 2. 3. 1. Diffusion: the movement of molecules from where there are many to where there are fewer. "_______________" concentration gradient. No energy required! ______________ _______________ Solute - sugar or salt _________ in a ________ or a ________ 2. Osmosis: the diffusion of __________ across a _________ _________ Water moves from where there is ______ water/________ solute to where there is ________ water/_______ solute. ______________ TRANSPORT! *Dynamic Equilibrium: movement of water ___________, Unit 3 - Cells Page 1  ________ water/_______ solute. ______________ TRANSPORT! *Dynamic Equilibrium: movement of water ___________, but net movement is _____________. Hypertonic Solution: ____________ solute in solution than in cell. Ex: Isotonic Solution: ____________ amount of solute in solution as in cell. Ex: Hypotonic Solution: ____________ solute in solution than in cell. Ex: Passive Transport Active Transport ppornelubio ppornelubio Facilitated Diffusion: when molecules use a _________________ to help them go through cell membrane. No Energy! ___________________ ____________________ Facilitated Diffusion: proteins "help" diffuse Additional Videos: phagocytose 1 Amoeba Feeds! Impulso Nervoso / Sinapse Cell Transport olivtitia John S. Mead Marjorie Bragança Amoeba Sisters Unit 3 - Cells Page 2