Summary
Summary IB Biology Topic 1.3 Membrane Structure
- Course
- Biology
- Institution
- 12th Grade
Handwritten summary of only topic 1.3 (Membrane Structure) in IB Biology. Clear diagrams and condensed onto one page.
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Membrane StructurePhospholipid
i2 sneiet.fieiytiiimmeaiieiiiiiiana
Regulatesthemovement substancesinandout
organicmolecules
ofcells
of
amphipatic
reversible hydrophilic
My propertiesofphospholipidbilayers
temporarilyandlooselyattached
interaction
hydrophilic
that infert
2hyga
abnifibdotdi.es 8th
hydrophobic oligosaccharide
nonp
1
Pfiffe
glycoprotein
80 proteinchanne
hygrepah 00080000 000000000000
hydy obic
P
All l ll ll l pygmyp
adf.dk dIddddrea
bilayerheldtogetherby
integralprotein cholesterol iaitiin i
weakfydeerhphf.fi interactions
permanentlyattachedtomembrane dindividilithiith fady'er
Transmembrane spanacrossbilayer
chge
p adf.gg mfhidityanayo.ws
gtoyocytos
that in
anchortomembrane
919 P wife
Cholesterol steroid typeoflipid
amphipathic present in animalcellmembran
g
mostlyhydrophobic 8 panheh.hphfaicepit.at
in hyadtrtorcaaitb
fails to attracted phosphateheads
cholesterol
oneendof molecule
has a hydroxyl OHgroup hydrophilic
Functions ofCholesterol
1 Disruptstheregularpackingofhydrocarbontails preventsphospholipidsfromcrystallizingandbehavingas
2 Restrictsmolecularmotion reducesmembranefluidityathightemperatures phospholipidshavetoomuchen
3 Reducesthepermeability
ofhydrophilicparticles sodiumandhydrogenions
4 Cholesterol'sshape canhelpmembranestocurveinto a concaveshape helpfulforformationofvesicles endoc
Functions of MembranePr
1 Hormonebindingsite insulinrecep
2 Celltocellcommunication receptors
Models Membrane Structure 3 Celladhesion toformtightjunctio
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