Chapter 5 Biology Test

· Membrane that has diverse protein molecules embedded in a framework of phospholipids. (Mosaic) Most of these molecules can drift about in the membrane (fluid.)

· –– when membranes allow some substances to cross more easily than others.

· – the tendency for particles of any kind to spread out evenly in an available space, moving from where they are more concentrated to regions where they are less concentrated.

· – How concentrated each side is

· – when both sides will have equal concentration

· – the diffusion of a substance across a biological membrane

· Water.

B

· – a physical model of the diffusion of water molecules across a selectively permeable membrane

· – what you are dissolving

· – what you are dissolving it in

· – the ability of a solution to cause a cell to gain or lose water.

· – same tension

· – a solution with a solute concentration lower than that of the cell. Can burst b/c too much water.

· – a solution with a higher solute concentration. Can die b/c not enough water.