BIOL 2202 Lecture Notes - Lecture 3: Lipid Bilayer, Membrane Fluidity, Thylakoid
27 Jun 2017
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Between outside of cell and inside, or between cytoplasm"s and inside an. Creates an environment (cid:498)socialized(cid:499) for the fx or biochemical reactions that. Membranes act as (cid:498)surfaces(cid:499) for biochemical reactions and cellular processes. Many reactions are more efficient on membranes than in solution why? take place within the compartment. Most prokaryotes lack internal membranes, thus do not have internal organelles: scaffold for biochemical activity. Components in the membrane interact with internal cytoskeletal components to connect the membrane to the cytoskeleton: selectively permeable. Size and charge affect the rate of diffusion across a membrane. Hydrophobic molecules small, uncharged polar molecules large, uncharged polar molecules ions. Mostly impermeable to large, uncharged polar molecules (glucose) and ions. Restricts movement f ions, creates different ionic composition on either side. Different concentrations of the same ion on opposite sides: solute transport. Membranes facilitate movement of ions or molecules from one compartment to another. Important for nerve ad muscle function, and energy formation.
