Warm-up What are the 3 components of cell theory? Balloon with vanilla.
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Transcript of Warm-up What are the 3 components of cell theory? Balloon with vanilla.
Warm-up
What are the 3 components of cell theory?
Balloon with vanilla
Explore---In groupsA Family has 2 petsLarge dog
Nice and sweetBut behaves poorly if no one is watchingTears up the yard…terrorizes catsBarks until everyone hates him
Little CatEveryone loves this cat…she’s purrrrfect!
Your job…next slide
Your Job Come up with a solution for the pet ownersThe dog can’t go outside unless the owners
are homeThe cat can come and go as she pleases
Keep in mind that the dog is 2.5ft tall….the cat is about 8 inches tall
Be very specific about the size and location of your solution
The Plasma (Cell) Membrane
Plasma Membrane Maintaining Balance
Separates living cell from nonliving environment
Allows steady flow of nutrients in an out of cellHomeostasis
Maintain the cell’s environmentSelective permeability
Allows some molecules into the cell while keeping others out
Structure of Phospholipid BilayerTwo layers of
phospholipids back to back
Lipid with a phosphate group attached
PhospholipidHead is polar –
interact with aqueous external environment (loves water = Hydrophilic)
Tails are non polar – avoid water, afraid of water = Hydrophobic
Water – soluble molecules will not pass through easily
Phospholipid Bilayer
polarhydrophilic
Heads
nonpolarhydrophobic
tails
polarhydrophilic
Heads
Fluid Mosaic ModelModel of the plasma
membrane
- fluid due to flexible nature of membrane
- phospholipids move like water current
- proteins in membrane create pattern
(mosaic) on membrane surface
It’s like a fluid…It’s like a mosaic…It’s the Fluid Mosaic Model!
MosaicFluid
Other ComponentsCholesterol
Helps stabilize phospholipids.Stops fatty acid chains from sticking together.
Proteins on membrane surface aid in cell identification.
Transport ProteinsSpan the width of the membraneRegulates which molecules may pass through
the membrane.
Various Functions
Outside
Plasma MembraneInside Cell
Transporter Enzyme Activity Receptor
Identity Marker Cell Adhesion Attach to Cytoskeleton