Hand-written summary notes using Seneca on the whole of Cell Membranes in Module 2 - Foundations in biology, OCR A-Level Biology (H420). This includes an overview on cell membrane structure; permeability and practical; passive movement; active movement; osmosis and practical.
Happy revising! :)
Contents:
• Cell Membrane Structure
• Permeability
• Passive Movement
• Active Movement
• Osmosis
, cell membrane structure
said model
mosaic
fluid mosaic model describes the structure of the plasma membrane as a mosaic of
phospholipids;cholesterol;proteins;carbohydrates thatgives the membrane a fluid
character
fluid' area is due to phospholipid bilayer
mosaic area is made up of various proteins;carbohydrates;lipid molecules that
punctuate membranes
plasma membrane is permeable, defining the boarders cells and
partially of mostorganelles
-
partially permeable-
means the membrane controls the movement ofmaterials freely
into or outof the cell
phospholipide
arrange themselves into a sun-lonm thick bilayer
contains 1 molecule
glycerol
contains 2 fatty acids, which are hydrophobic so face inwards in the bilayer
contains phosphate
1 -
linked head group, which are hydrophilic so face outwards
in the bilayer
i
Pi
FATTY ACID
fATTY ACID
cholesterol
cholesterol is a lipid sits
that with phospholipids in the core the
of membrane,
bound to fatty acid hydrophobic tails
increase membrane rigidity in order to help maintain cell shape
not found in bacterial cell membranes
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