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Chap 3 class notes
BILayer structure
[HIGH YIELD]

the bilayer or plasma membrane is intergral to a cell
it's primary functions ; to control what enters / exists the cell + acts as a
barrier between external and internal cellular environemts
primarily consists of ;
phosphilipids that make up the phospholipid bilayer → these consits of
glycerol phosphate heads which are hydrophilic and hence polar, pointing
towards polar mediums → 3 fatty acid tails that are non-polar and hence
hydrophobic
...
Allow for transprotation thru active
or facilitated diffusion of polar/large molecules
Passive transport
Diffusion
[HIGH YIELD]

the passive movmenet of small, hydrophobic molecules through a semipermeable membrane with the natrual concentration gradient, from regions
of high concentration to low concentrations
...

Often, these molecules attach to the channel/carrier protein that undergo a
confortational change → pushing the molecule through the memrbane
Osmosis
[HIGH YILED]

osmosis is the passive, net movement of free H2O molecules through a
semi-permeable membrane, with the natrual concentration gradient from
regions of Hypotinc ( low solute =high solvent ) concentrations to
Hypertonic (high solute = low solvent ) concentrations
...
→
membrane concaves to allow for target molecules to enter the cell
...

Pinocytosis is the engulfment of liquid / indissolveable molecules
Exocytosis
[HIGH YIELD] - PROTEIN EXPORTATION

the bulk transport of molecules out of a cell
...

Mahad Adnan, 2020 BIO

Chap 3 class notes

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