Reputation: 1571. E-filed in Early February and it took about 7 weeks to get my refund. It might have something to do with the amount as well. I got back $1,500 from the state which is probably more than most people get, so it could have taken longer for the larger payment.
Diffusion and Osmosis. Diffusion. -the process by which molecules spread from areas of high concentration, to areas of low concentration. Concentration gradient - a difference between concentrations in a space. Molecules will always move down the concentration gradient, toward areas of lesser concentration.
Facilitated diffusion is the way in which cells are able to import larger molecules through the cell membrane. The cell membrane is a barrier which surrounds all cells and only allows small and uncharged molecules to pass through freely. Larger molecules, such as glucose, require special transporting proteins. The transporters for glucose bind to glucose molecules and then facilitate their transfer into the cell. There are five different types of glucose transporters, named GLUT 1-5.