1. Warmup Download the Popplet App Create a New Popplet titled:
“Gummi Bear Lab – Last Name”
Set Up Popplet as follows:

2. Warm Up for 10/4:
In a sentence or two, explain why the oil can’t “mix” with the water molecules.

3. Cell Membrane
The cell membrane is a double-layered sheet called a lipid bilayer.
This layer forms a strong barrier between the cell and its surroundings.
Said to be semipermeable or selectively permeable

4. 3 Main Functions of Cell Membrane
Boundary – Separates the cells from each other and their environment

5. 3 Main Functions of Cell Membrane
Regulator – Allowing the transport of some substances into and out of the cell, but not others
Semi- or Selectively Permeable

6. 3 Main Functions of Cell Membrane
Signaling – allows cells to signal other cells. Cells have proteins called receptors that bind to signaling molecules and initiate a physiological response. Example: Hormones
Different receptors are specific for different molecules.
Receptors can also respond directly to light or pressure.

7. Parts of the Cell Membrane
Phospholipid Head –
Creates the outside of the membrane
Polar
Hydrophilic – Water Loving

8. Parts of the Cell Membrane
Phospholipid Tail –
Creates the inside of the membrane, causes membrane to stay together
Nonpolar
Hydrophobic – Water Fearing

9. Parts of the Cell Membrane
Integral Proteins –
Completely inside the lipid bilayer
Control entry and removal of specific substances
Channel and carrier proteins

10. Parts of the Cell Membrane
Peripheral Proteins –
Bound to the exterior side of the membrane
Has various functions

11. Parts of the Cell Membrane
Cholesterol –
Help keep the fluidity of the membrane
Fluid Mosaic Model

12. Parts of the Cell Membrane
Carbohydrate Chains –
Serve as the “fingerprints” of the cell
Glycoproteins and Glycolipids allow the cells to recognize each other

13. 4 Main Functions of Cell Membrane
Recognition – help cells identify self from non-self
*Glycoproteins and Glycolipids allow the cells to recognize each other*

14. Picture of Cell membrane