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bio 121- membranes
| Question | Answer |
|---|---|
| compartmentalization | |
| separating the inside and outside of a cell | |
| plasma membrane | involved in cell communication. defines our cell |
| pure lipids | liposomes |
| cholesterol | increase rigidity decrease fluidity |
| endoplsmic reticulum | synthesis of lipids |
| fluidity of a lipid bilayer depends on | composition |
| membrane assembly begins | endoplasmic reticulum |
| outer leaflet | site of phospholipid and cholesterol production |
| glycolipids | short carbohydrate chains |
| intergral proteins | hydrophobic regions can pass through lipid of membrane |
| membrane protiens | 2% of molecule but 50% of memebrane weight |
| golfi complex | determines membrane structure |
| actin microfilaments | supports cell cortex |
| glycolipids | 5% membrane lipids |
| membrane is reinforced by | the underlying cell cortex |
| transmembrane protiens | completely pass through hydrophobic regions |
| spectin | cellular cortex |
| intergral proteins | extracellular matrix |
| provides ID tag | sugars / carbs |
| add carbohydrate moadity to phospholipids | golfi |
| protein synthesis | rough er |
| ions | never go through plasma membrane |
| completely non polar | can go through plasma membrane |
| aquaporien | water through plasma membrane |
| small can get through plasma membrane | because it’s small |
| large and charged | can’t go through |
| membrane potential | difference in charge across plasma membrane |
| fixed anion | counteracts phosphate group |
| potassium channel | most important ion channel |
| leaky phosphate channel | resting membrane potential |
| why is molecular oxygen non polar | it is symmetrical |
| potassium has a | low concentration |
| sodium is drawn to | outer leaflet |
| transporters and channels don’t need | atp |
| guides movement | concentration |
| ion channels move | faster |
| channels allow | hydrophilic movement |
| transporters | move solutes |
| mechanisms | passive and active transport |
| passive - no atp | simple diffusion - molecular oxygen |
| active transport | movement against concentration gradient |
| osmosis | movement of water down its gradient |
| hydrostatic pressure | stops osmosis |
| osmosis | movement of water down its own conversation gradient |
| increase permeability | increase protein channels |
| osmolarity | number of osmoles per liter of solution |
| hypotonic | absorb water |
| phagocytosis | white blood cells - unique regulated |
| pinocytosis | every cell in body not regulated |
| endocytisis | phagocytosis pintosis |
| endocytosis | white blood cells receptor mandated endocytosis regulated |
| exocytosis | ca2+ regulated exocytosis |
Created by:
kylei.rooney