Cell Membrane
Review Questions
• What three things make up a phospholipid?
Draw and label where the 3 things are located.
• Draw a section of the cell membrane: where
are the hydrophilic and hydrophobic regions?
• What makes something hydrophilic or
hydrophobic?
Unsaturated Fatty Acid Tails
• Tails are bent (unsaturated) causing fluidity
• Membranes solidify when they get cold
• Membranes with unsaturated phospholipid
tails solidify at a lower temperature
• Organisms adapted to cold climates have
more unsaturated phospholipid tails
Semi-Permeable
You Shall Not Pass
• Can Easily pass through
– Small, uncharged, non-polar
• Cannot easily pass through
– Big, charged, polar (bear)
“Fluid Mosaic Model”
• Phospholipid bilayer with many “floating”
parts
Transport Proteins
• Channel Proteins
• Gated Channels
• Receptor Proteins