Wednesday, September 15, 2010

Fluid Mosaic Model!

We have begun our discovery about cellular transport by exploring the components of the cell membrane.  The main components are phospholipid that have 3 regions: phosphate head, glycerol backbone, and 2 fatty acids chains. 
The phosphate head region is polar.  Polar substances have a slight negative and positive charge that allows them to chemically interact with a variety of substances.

The fatty acid chains are non-polar meaning they have little to no charge and don't interact with those substances that do have a charge.

 Two layers of these phospholipids are sandwiched back to back (i.e. fatty acid to fatty acid) to form what is known as the phospholipid bilayer.

In this layer there are several items that are stuck in to allow further access and provide recognition.

Cell Membrane Components

Follow this link to a review of the cell membrane in general and then click on highlighted words to follow the trail for new information.

Make sure that you look into the membrane proteins, cholesterol, and carbohydrates that are a part of the cell membrane. 

Osmosis Eggs

In other news, we observed our osmosis eggs after soaking in vinegar overnight.  We noticed that our eggs were without their shell and swollen with vinegar.  We also measured our vinegar remaining and saw that 10-60 mL were missing.  Since the egg is swollen and the vinegar level is down, we concluded that the vinegar passed into the egg and out of the beaker.  If you would like to look at pictures, then click the link above.

See you guys tomorrow!!!

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