Chapter 7.3: Structure of the Cell Membrane
How is a colander (sifter) similar to a cell membrane? Read on to find out. 1. What are some things that can pass through a colander (sifter)? 2. What are some things that cannot pass through a colander (sifter)? Why is it important to keep these things from moving through the colander (sifter)? 3. The cell is surrounded by a cell membrane, which regulates what enters and leaves the cell. Why is it important to regulate what moves into and out of a cell? In or Out?
Parts of Cell Membrane Phospholipids (lipids with phosphate groups) Proteins
Phospholipids Two parts a polar head group and a nonpolar tail group Nonpolar tail Polar head The phospholipids line up next to each other to form a lipid bilayer (2 layers)
The nonpolar region acts as the barrier and separates the cell from its environment.
Proteins Types of proteins 1. Channel proteins 2. Receptor proteins 3. Markers
Channel Proteins: Act like tunnels to allow specific molecules through Receptor Proteins: Transfers information from outside to inside the cell Triggers a response inside the cell by a molecule attaching to outside of cell Markers: Identifies the cell– “Name tag”
References membrane.htm membrane.htm membrane.htm ee/BIOBK/BioBookCELL2.html#The%20C ell%20Membrane ee/BIOBK/BioBookCELL2.html#The%20C ell%20Membrane ee/BIOBK/BioBookCELL2.html#The%20C ell%20Membrane
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