BIOL 1F90 Lecture Notes - Lecture 12: Mechanosensitive Channels, Peter Agre, Facilitated Diffusion
25 Oct 2016
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Knowing subatomic particle, atomic mass atomic weight, chemical bonds/charges, polar/nonpolar, ph lots of hydrogen in both directions*** Orgnic macromolemcle monomer, polymer, how to make unique characteristics. Animal cells cannot generate osmotic pressure to counter the flow of water when in a hypotonic environment. Some wall-less protists have contractile vacuoles to actively expel water and prevent bursting when in a hypotonic environment: vacuoles that fuse with membrane and squeeze all water out. Transmembrane proteins that provide a pathway for the movement of specific ions and hydrophilic molecules across the membranes. Allow biological membranes to be selectively permeable to small molecules and ions. Transmembrane proteins that form a passageway for the facilitated diffusion of ions or molecules across the membrane: facilitated diffusion does not need energy. Most channels are gated (need a ligand, protein to signal channels to open: can open to allow the diffusion of solutes and close to prohibit it, allow cells to regulate the movement of solutes.
