Review from yesterday Write on a Post-It Note one fact about diffusion Write on a Post-It Note one fact about osmosis 2 Post-Its total per table group Put on the wall

Review from yesterday In your textbooks, read p. 64-67 and make a Venn diagram with 2-3 points in each circle comparing osmosis, diffusion and facilitated diffusion Compare answers as a class

Egg Demo Jar A: Egg + table syrup Jar B: Egg + distilled water Jar C: Egg + nothing What do you think will happen to the egg in each jar? We will find out tomorrow!  Pictures will be uploaded to the website when the demo

Facilitated Diffusion Particles are helped across the cell membrane by hydrophilic proteins embedded in it Ions like Cl- and Na+ cross through a channel Large polar molecules (like glucose) can be bound by a protein Polar bond: covalent bond between two atoms where electrons are shared unequally Because of this, one end of the molecule is slightly positive and the other is slightly negative in charge

Facilitated Diffusion Move from an area of high concentration to low concentration Does not require energy from the cell Used for molecules that are too big to pass directly through the cell membrane or protein channel

Facilitated Diffusion

Facilitated Diffusion Molecule bounces into a specific carrier protein Carrier protein binds molecule Carrier changes shape and flips over, bringing molecule into the cell Carrier protein resumes its shape

Facilitated Diffusion http://highered.mheducation.com/sites/0072495855/student_view0/chapter2/animation__how_facilitated_diffusion_works.html

Tomorrow Dialysis Tubing Lab for full period! Discussion questions and observations will be handed in later on