Creating a cell membrane
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!
Clues…… Hydro- Philic – Phobic- having an attraction towards Water Philic – having an attraction towards Phobic- having an aversion towards
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
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
Check YOUR DESIGN!
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.