Name Yamani Woody
Using the websites listed, answer the following questions.
Website #1: http://www.usd.edu/~bgoodman/Membrane.htm http://www.biologymad.com/cells/cellmembrane.htm 1. What invention came along that enabled us to better see the cell membrane? Electron Microscope
2. What are the two parts (list the first two listed) of the cell membrane? Phospholipids and proteins
3. What is one of the cell membrane’s jobs? It controls how substances can move in and out of the cell
4. What is the location of the cell membrane? along the outer edges of each and every cell, as it is the wall that contains the cell contents
5. The heads of phospholipids (lipids) are hydrophilic so they like to be with water.
6. The tails of phospholipids are hydrophobic .
7. Click on Phospholipids
a. Draw a phospholipids and label the two parts.
b. The heads of phospholipids are composed of what two things? Phosphate and Gycerol
c. What is another name of water-loving? hydrophilic
d. The tails of phospholipids are mostly what? hydrophobic
8. Click on the Back button (at the top of the Internet Explorer page)
9. Click on Osmosis.
a. When water diffuses, the process is called osmosis
b. Water moves from high concentration gradien of water to a low concentration gradien of water.
c. What type of membrane does water cross? Permeable Cell Membrane
444Website #2: http://www.tvdsb.ca/webpages/brownt12/files/osmosis.htm
1. Define osmosis. Movement of water across membranes that does NOT require cellular energy
2. Hypertonic solutions contain high concentration of solute when compared to another solution.
3. When a cell is placed in a hypertonic solution, what happens to the cell? shrivels
4. Play the small movie.
5. Hypotonic solutions contains a low concentration of solute when compared to another solution.
6. When a cell is placed in a hypotonic solution, what happens to the cell? swells
7. Play the small movie.