Osmosis in Onion Cells

Posted on Feb 9, 2016 in Biology, cell membranes osmosis diffusion

Target: Demonstrate Osmosis in a plant cell in a solution of lower concentration of water compared to the onion cell. How:  After making a wet mount of a red onion cell, draw a 10% NaCl solution across a slide to cause water to leave the cell. Procedure: Wet Mount of Onion Cell  Bring a slide […]

Diffusion and Cell Membranes with Eggs

Posted on Feb 4, 2016 in Biology, cell membranes osmosis diffusion

Target:  Explain why water moves across a semi permeable membrane whereas other molecules do not.  Also, explain what determines the overall direction that water moves. How:  De-calcify an egg making it a semi permeable membrane, then place the egg in different solutions while predicting, measuring changes, and concluding reasons for the changes in the egg […]

Born Wet, Human Babies Are 75 Percent Water. Then Comes The Drying

Posted on Sep 16, 2014 in Biology, cell membranes osmosis diffusion

http://www.npr.org/blogs/krulwich/2013/11/25/247212488/born-wet-human-babies-are-75-percent-water-then-comes-drying

Diffusion, Active Transport, Facilitated Diffusion Media Resources

Posted on Sep 14, 2014 in Biology, cell membranes osmosis diffusion

The following are helpful resources for understanding the concepts in cell transport (movement of molecules across the cell membrane) Extra Credit Extension: Draw a cell membrane demonstrating diffusion, facilitated diffusion, and active transport.  Include the following in your diagram: *energy required (ATP) or not*concentration gradient needed (high to low or can move low to high) […]

How you catch Ebola: By air, sweat or water?

Posted on Sep 14, 2014 in cell membranes osmosis diffusion

http://www.npr.org/blogs/goatsandsoda/2014/09/12/346114454/how-do-you-catch-ebola-by-air-sweat-or-water Error in article:  viruses are not cells.  They do not have cell membranes, though they do have a semi permeable outer layer.  The outer layer of a virus is protein.