1. Creating a cell membrane

2. Cell membrane Take one bag
create a model of what you think would be the look of a small portion of a cell membrane
Listen to the clues and decide if you wish to change your model as we go
Finally….see if you were right!

3. Clues…… Hydro- Philic – Phobic- having an attraction towards
Water
Philic –
having an attraction towards
Phobic-
having an aversion towards

4. Clues…… The cell (plasma) membrane is composed mainly of phospholipids
The cell membrane is made of a phospholipid Bilayer
There is a cytoplasm inside the cell and other fluids surround the cell (contains water)
Molecules that are hydrophobic can easily pass through the plasma membrane (IF Small Enough)
Molecules that are hydrophilic cannot pass through without help
Bilayers are particularly impermeable to ions, which allows cells to regulate salt concentrations and pH

5. Clues……
Phospholipid bilayers are embedded with proteins, which may be either permanently or temporarily attached to the membrane
The amino acids of a membrane protein are localized according to polarity:
Non-polar (hydrophobic) amino acids associate directly with the lipid bilayer
Polar (hydrophilic) amino acids are located internally and face aqueous solutions
embrane proteins can serve a variety of key functions:
Junctions – Serve to connect and join two cells together 
Enzymes – Fixing to membranes localises metabolic pathways 
Transport – Responsible for facilitated diffusion and active transport 
Recognition – May function as markers for cellular identification 
Anchorage – Attachment points for cytoskeleton and extracellular matrix 
Transduction – Function as receptors for peptide hormones 
Mnemonic:  Jet Rat

6. Check YOUR DESIGN!

7. Facts about Lipids:
include fats, waxes, sterols, fat-soluble vitamins (such as vitamins A, D, E, and K), monoglycerides, diglycerides, triglycerides, phospholipids, and others.
Lipids have applications in the cosmetic and food industries as well as in nanotechnology.
The glycerol backbone is found in all lipids known as triglycerides.