BIOL 1001 Lecture Notes - Lecture 2: Nucleolus, Chromatin, Nucleoplasm
18 Oct 2016
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Document Summary
Membrane proteins transport- glucose transporter receptor- for growth hormone, insulin, etc. recognition proteins- abo blood type on cell surface. Diffusion: although molecules collide randomly, net movement is away from the place with the most collisions (down a gradient) Movement due to brownian motion: the zig-zag, irregular motion exhibited by minute particles of matter when suspended in a fluid. Random drifting of particles suspended in a fluid, a liquid of a gas. Ex) diffusion of an odor in a room, or dye in an aquarium. Diffusion of water molecules across a selectively permeable membrane. Osmosis: the diffusion of water across a permeable membrane from a region of higher water concentration to a region of lower water concentration. Direction of net flow is determined by water concentration gradient. Side with the most solute molecules has the lowest water concentration. Tonicity: relative solute concentration of 2 fluids. Original gatorade was isotonic in salt concentration, hypertonic in sugar concentration.
