1. Bozeman
Cell Membrane- Bozeman (Resources Page)

2. Selective Permeability
Cells
Some have
All Have
Cell Membranes
Cell Wall
Described by
Provides
Provides
Structure
Fluid Mosaic Model
Selective Permeability
For
For
For
Plants
Fungi
Bacteria

3. Selective Permeability
Cell Membranes
Described by
Provides
Fluid Mosaic Model
Selective Permeability
Made up of
Phospholipids
Proteins
Cholesterol
Glycoproteins
Glycolipids
Are
Regulate
Amphipathic
Transport
Which
allows in…
Which
allows in…
Small and uncharged particles
Large and charged particles

4. How Do We Describe The Membrane?
It is Selective Permeable
Allows some substances to cross it and not others.
It is described using the Fluid Mosaic Model
fluid, or moving, structure with a “mosaic” of various proteins embedded in or attached to the membrane.
It is a bilayer made of phospholipids.

5. Phospholipid Bilayer Phospholipids are described as amphipathic
having a hydrophobic portion and a Hydrophilic portion.

7. Parts of the Cell Membrane
Cholesterol- connect phospholipids together and keeps them from drifting apart too quickly
Prevents from falling apart if it gets too hot or getting to close if it gets too cold.
Glycoprotein- made up of proteins and sugars
Antibodies are glycoproteins
Glycolipids- Fats with sugars attached and are used for signaling.

8. What Can Move Across the Membrane?
If a molecule is really small and has no charge, it can cross the phospholipid bilayer.
Examples are Carbon Dioxide and Oxygen because of these two properties.
Large and charged molecules have to use proteins to get through the membrane.

9. Two Types of Proteins
Peripheral proteins- bound to the surface of the membrane.
Integral proteins- penetrate the hydrophobic core.
If they span the membrane they are called transmembrane proteins.

10. Transport Proteins
Allow passage of hydrophilic substances across the membrane.
Channel proteins- transport proteins that have a hydrophilic channel that molecules or ions can use as a tunnel
Aquaporins- facilitate the passage of water.
One major protein is the Sodium Potassium Pump.