Finish up cell membrane - start into passive transport

Thursday November 8^th

Describe the location of enzymes within the plasma (cell) membrane.

Enzymes are located on the inside surface of the cell membrane (facing the inside of the cell)

Both enzymes and glycoproteins are found on the surfaces of the cell membrane, what is the difference between WHAT surface they are found on and how does that relate to their functions?

Name tag on OUTSIDE surface of my
 lab coat makes sense.....

Enzymes are found on the inside surface while glycoproteins are found on the outside surface. How does this relate to their function? Since enzymes are involved in chemical reactions INSIDE the cell, it would make sense that they are found on the surface facing inside the cell. Glycoproteins on the other hand have a carbohydrate chain on the outside that acts as a "name tag" for the cell. Because of THIS, you wouldn't see the name tag INSIDE the cell (anymore than if you were asked to put a nametag on your shirt that you decided to put in on the INSIDE of your shirt!!!)

Putting the nametag on the INSIDE of my 
lab coat does NOT!!

Draw a cell membrane similar to the model you made yesterday labeling the polar phosphate heads, fatty acid tails, a transport protein, a receptor protein an enzyme and cholesterol.  (be prepared to identify what the FUNCTIONS of each of these are as well)

Glyco is the Glycoprotein - Carb is referring to the carbohydrate portion
of the glycoprotein.  The yellow protein is a receptor protein (it may
be hard to read)  We also discussed all the functions and how they
relate to their structure.

After these (which we spent a LOT of time on) we then moved into passive transport notes.  Please check Edline.  While we wrote those, we did the following demonstration.

The dye molecules will move from an area of High Concentration
to low concentration

After getting notes on concentration gradients - you guys
set up your own concentration gradient with water
and food coloring.

Until the concentration is equal EVERYwhere.
This is known as dynamic equilibrium