Lecture 10/12 - POST EXAM NOTES!
Lecture 10/12 - POST EXAM NOTES! 10400
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This 1 page Class Notes was uploaded by Aleena Watson on Sunday October 16, 2016. The Class Notes belongs to 10400 at Portland State University taught by Mandy Lee Hill Cook in Fall 2016. Since its upload, it has received 19 views. For similar materials see PRINCIPLES OF BIOLOGY I - BI 211 - 002 in Biology at Portland State University.
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Date Created: 10/16/16
Lecture notes 10/12 (post exam) Lipids Phospholipid Bilayer 1. When placed in H2O, the polar ends looks for hydrogen and tails pull together on the inside 2. Lipid bi (2) layer (sheets) 3. Membrane fluidity is regulated by by hydrocarbon tails are stacked together a. If stacked together closely, less fluid ie) Skin - highly packed, less fluid Phospholipase - dissolves membrane of red blood cells and cells WILL DIE - Great barrier - which is great for cellular respiration - As cells get bigger, less permeability - Ions dont move through the cells well - Transmembrane proteins come into play - Unsat C, C bond can’t stack as dense, - More permeable - Saturated long double bonds - Less permeability Diffusion Random process (brownian motion) that substances move from: - High to low concentration - Heat increases rate Dynamic equilibrium Osmosis Because of phospholipid bilayer we have osmosis. We need to move the solutes and water. Diffusion of H2O. Super important in our bodies, we have transmembrane proteins called aquaporins that allows water to move really quickly through cell membrane quickly. Present in every domain! Key terms: Osmotic (relative to water) concentration - the total concentration of solutes in our solution - Hypertonic (above or beyond - hyper) - solution with high concentration - Hypotonic (below) - lower concentration - Isotonic - same *******Use above terms ONLY when comparing to another solution********
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