Plasma Membrane and Cell Transport Ms
3
Plasma membrane and cell transport 1. DIFFUSION – 1) molecules/ions move down/with a concentration gradient; 2) rate increased by a greater concentration difference/ higher temperatures/ smaller molecules or ions/ larger surface area of membrane/ smaller diffusion distance; 3) Credit example of diffusion e.g. oxygen, carbon dioxide, water; FACILITATED DIFFUSION - 4) molecules/ions move down/with a concentration gradient; 5) requires protein channel/ carrier membrane; 6) credit example of facilitated diffusion, such as glucose/amino acids/named ion; OSMOSIS – 7) movement of water; 8) From high/less negative water potential; 9) Across partially permeable/ membrane; ACTIVE TRANSPORT - 10) molecules/ions move down/with a concentration gradient; 11) requires protein channel/carrier membrane; 13) credit example e.g. sodium/potassium/proton pump; ENDOCYTOSIS (exocytosis/pinocytosis/phagocytosis) – 14) Description of process; 15) Active transport/endocytosis etc., require ATP /energy OR diffusion/facilitated/osmosis do not req energy 2. Process Takes place against a concentration gradient Requires energy in the form of ATP Diffusion X X Facilitated diffusion X X Osmosis X X Active transport 3. (a) Phospholipid ; 1
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Plasma Membrane and Cell Transport Ms
Transcript of Plasma Membrane and Cell Transport Ms
Plasma membrane and cell transport1. DIFFUSION 1) molecules/ions move down/with a concentration gradient; 2) rate increased by a greater concentration difference/ higher temperatures/ smaller molecules or ions/ larger surface area of membrane/ smaller diffusion distance; 3) Credit example of diffusion e.g. oxygen, carbon dioxide, water; FACILITATED DIFFUSION - 4) molecules/ions move down/with a concentration gradient; 5) requires protein channel/ carrier membrane; 6) credit example of facilitated diffusion, such as glucose/amino acids/named ion; OSMOSIS 7) movement of water; 8) From high/less negative water potential; 9) Across partially permeable/ membrane; ACTIVE TRANSPORT - 10) molecules/ions move down/with a concentration gradient; 11) requires protein channel/carrier membrane; 13) credit example e.g. sodium/potassium/proton pump; ENDOCYTOSIS (exocytosis/pinocytosis/phagocytosis) 14) Description of process; 15) Active transport/endocytosis etc., require ATP /energy OR diffusion/facilitated/osmosis do not req energy2. ProcessTakes place againsta concentrationgradientRequires energy inthe form of ATP
DiffusionXX
Facilitated diffusionXX
OsmosisXX
Active transport
3. (a)Phospholipid ;1(b)AGlycerol / propan 1,2,3 triol ;BEster bond / ester linkage ;2(c)Insoluble in water / does not dissolve in water / non-polar ;1(d)(Fluid because) phospholipids move (around membrane) ;(Mosaic because) membrane contains proteins /glycoproteins (lying amongst phospholipids) / eq ;2[6]4. (a)(net) movement / eq of, molecules / ions / particles / gases / solute / namedexample ;from high concentration to low concentration / down a concentration gradient ;[ignore references to membrane]2(b)concentration gradient / eq ;temperature ;(diffusion) distance / thickness (of membrane) ; [not size]permeability (of membrane) ;surface area (of membrane) ;size of, molecules / ions / particles ;polarity / solubility in lipids / eq ;2(c)(active transport) up / against concentration gradient / from low to highconcentrations / involves carriers / ATP / energy / respiration ;1[5]
5. (a)(i)Movement down concentration gradient / eq ;Involves protein in membrane ;2(ii)(Active transport) requires, ATP/ energy ;(Active transport) occurs against/up the concentration gradient ;2
6. (a){Fatty acid / tails} are {hydrophobic / non-polar} ;(so orientate themselves) away from {water / polar environment} ;{Phosphate / heads} are {hydrophilic / polar} ;(so can) interact with {water / polar environment} ;3(b)Correct measurement ; [27 mm or 37 / 38 mm]Divide by magnification ;Correct conversion to m ; [answer = 0.009 or 0.012 / 0.013]3(c)Carbohydrate: Cell recognition / cell adhesion / eq ;1Protein: Transport of molecules / eq ORreceptor for hormone / eq OR enzymes ;1[8]
