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TRANSCRIPT
Cell Membrane Foldable
“Fluid Mosaic Model”
The Cell Membrane
Proteins – decrease membrane fluidity
Functions of Membrane …
Hydrophilic (water loving)
Hydrophobic (water fearing)
Glycerol
1) Phospholipid (increase fluidity)
Main component of membrane
•Choline (hat)
•Phosphate (head)
•Glycerol (neck)
• Fatty Acids (tails)• Saturated – single bond = straight• Unsaturated – double bond = bent
2) Phospholipid bilayer
Hydrophobic tails face each other to avoid water.
•Only small and nonpolar (O2) or polar (H2O) can cross
• Large or charged ions can not pass
3) Integral Protein
Are embedded deep in the bilayer or cross through the entire layer.
Channel Protein
•Passive Transport
•Moves from high to low concentration
4) Peripheral Protein
Are on surface or shallow in the bilayer.
•Regulates cell signaling
5) Cholesterol
Hydrophilic OH- head and hydrophobic body (4 rings)
•Align with phospholipids
•Regulate fluidity
6) Glycolipid
Marker for cell recognition
Source of energy for the cell
(edible name tag for cell)
7) Oligosaccharide
•Recognition protein (name tag for protein)
8) Glycoprotein
•Acts in cell signaling
•Allows for communication
9) Transport
Used to move large or charged molecules
• Facilitated and active transport
10) Attachment and Recognition
Attach to cytoskeleton or to other cells (anchors)
• aka Adhesion proteins
11) Receptor for Signaling
Bind to hormones or growth factors
• Triggers a chain of reactions within the cell
12) Enzymatic Activities
Catalyze biochemical reactions
e.g. ADP + P+→ ATP
Ion Carrier
Pump Protein • Active Transport• Moves from low to high concentrations
ADP + P+ ATP
Cytoskeleton filament