BIS 2A Lecture Notes - Lecture 3: Lipid Bilayer, Micelle, Homeostasis
29 Apr 2019
School
Department
Course
Professor
Cell$membranes
If$phospholipid$bilayer
Nonpolar$molecules$can$pass$through$easily,$polar$molecules$require$ion$channels
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If$water$is$on$both$sides$of$membrane$then$bilayer$forms,$if$water$is$only$on$one$side,$then$micelle$is$formed
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Length$of$fatty$acid$tails$also$determines$shape
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•
Saturated$fats$are$solid$at$room$
temperature
Flat$uniform$structure$can$
stack$well,$therefor$remain$
solid$at$room$temp
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•
Unsaturated$fats$are$liquid$because$
of$bend,$they$cannot$stack$and$
remain$solid
•
Cell$Survival$Guide
Need$energy
Import$nutrients
Metabolism:$convert$environmental$energy$to$
useable$energy
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§
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Maintain$homeostasis
Sense$the$environment
1)
Respond$to$the$environment
2)
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Remove$waste
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Reproduce
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Outcompete$others
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Genetic$material:$recipe$book$for$proteins
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Communication
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Variability$(loose$genetics)$->$adaptation
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•
Environmental$Factors
Temperature
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pH
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Pressure
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Biotic$factors
Nutrient$availability
§
Predation
§
Competition$
§
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Salinity$
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Turbulence,$if$the$environment$is$
moving
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•
Discussion(-1/24/19
Thursday,*January*24,*2019
6:37*PM
