Lecture 3- cell membranes

Basicstructureofamembrane glycerol

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Unformatted text preview: ome"proteins"are"meant"to"recieve" signals;"receptors"for"neurotransmitters,"hormones"or" other"molecules !Intercellular"joining!"junctions"!proteins"can"serve" functions !Cell!cell"recognition!"cells"recognize"foreign"substances" (ex."blood"transplant,"organ"transplant)!!!>"proteins" molecules"that"have"an"orientation"that"is"known"to"that" 10:25 organism!"if"wrong"pattern"is"sensed!"object"is"known"as" 5 Gardiner 2013 being"foreign."Cells"must"be"able"to"sense"each"other" during"development"because"after"developmenet"they" can"not"move"around !Attachment"to"the"cytoskeleton"(runs"through"the"cell)" and"extracellular"maxtrix"(ECM!"collection"of"proteins" Phospholipids outside"of"plasma"membrane) phospholipids -phosphate group !Basic*structure*of*a*membrane -glycerol !Made*up*of*a*phosphate*group,*sugar*glycerol*and*2* -two fatty acids fatty*acid*chains !The*fatty*acids*chains*(tails)*are*HYDROPHOBIC*(water* fearing)*and*non*polar Hydrophilic head !The*head*is*HYDROPHILLIC*(water*loving)*and*polar !Amphiphatic*is*the*property*that*states*that*all* Hydrophobic tails Similar to Figure 5.4a molecules*contain*a*region*that*is*hydrophobic*and* hydrophillic !Molecules*readily*form*membranes*in*aqueous* solutions*without*any*external*force*due*to*hydrophillic* and*hydrophobic*properties 2 !When"added"to"an"aqueous"solution,"phospholipids" Phospholipid Membrane self!assemble"into"one"of"three"structures: (1)!Micelle!"all"tails"pointing"inside"and"hydrophillic" heads"out"in"water (2)Liposome!"inner"and"outer"portion"("like"a"little"cell) (3)Phospholipid"bilayer!"if"there"are"a"lot"of"them...
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This note was uploaded on 02/11/2014 for the course BIO 1202B taught by Professor Almanke during the Winter '12 term at UWO.

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