Chapter 5 Biology Test

Biology  

50 cards   |   Total Attempts: 182
  

Cards In This Set

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Fluid mosaic
· Membrane that has diverse protein molecules embedded in a framework of phospholipids. (Mosaic) Most of these molecules can drift about in the membrane (fluid.)
Selective permeability
· –– when membranes allow some substances to cross more easily than others.
Diffusion
· – 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.
Concentration gradient
· – How concentrated each side is
Equilibrium
· – when both sides will have equal concentration
Passive transport
· – the diffusion of a substance across a biological membrane
What is one of the most important substances that crosses membranes by passive transport?
· Water.
A
B
Osmosis
· – a physical model of the diffusion of water molecules across a selectively permeable membrane
Solute
· – what you are dissolving
Solvent
· – what you are dissolving it in
Tonicity
· – the ability of a solution to cause a cell to gain or lose water.
Isotonic
· – same tension
Hypotonic
· – a solution with a solute concentration lower than that of the cell. Can burst b/c too much water.
Hypertonic
· – a solution with a higher solute concentration. Can die b/c not enough water.