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Biology Week 4 Notes 9/13-9/19

by: Elizabeth Schnarr

Biology Week 4 Notes 9/13-9/19 BIOL 107-06

Marketplace > Truman State University > Biology > BIOL 107-06 > Biology Week 4 Notes 9 13 9 19
Elizabeth Schnarr
Truman State

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About this Document

These notes cover the lecture in class this week. The lecture focused on cell membranes. This set of notes goes into detail on the topics of diffusion, osmosis, membrane proteins, active transport,...
Introduction to Biology I
Daniela Ostrowski
Class Notes
Bio, Biology, Osmosis, Cell, Membranes, Diffusion, active, transport, Facilitated
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This 2 page Class Notes was uploaded by Elizabeth Schnarr on Thursday September 15, 2016. The Class Notes belongs to BIOL 107-06 at Truman State University taught by Daniela Ostrowski in Fall 2016. Since its upload, it has received 5 views. For similar materials see Introduction to Biology I in Biology at Truman State University.

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Date Created: 09/15/16
Week 4: 9/13­9/19  Biology  Lecture 4: Cell Membranes      Permeability  ● Permeability is how easily/fast molecules can go from one side to the other  (usually small, nonpolar, uncharged molecules can easily cross a bilipid  membrane)  ● Hydrocarbon chains that are unsaturated with short chains have a high  permeability  ● If temperature increases, so will permeability      Diffusion  ● Diffusion is movement of molecules and ions that result from their kinetic energy    ● Concentration gradient is the difference in solute concentration  ● There is a net movement from regions of ​high concentration to regions of low  concentration  ● Chemical equilibrium is when the molecules are equally distributed throughout  the solution   ● Temperature speeds up diffusion      Osmosis  ● Osmosis (special case of diffusion): ​movement of water and holds back solutes  (selectively permeable)  ● Hypotonic­ fewer solutes inside the membrane, so ​water moves out​ of the vesicle  and therefore the vesicle shrinks  ● Hypertonic­more solutes inside the membrane, so ​water moves in​ of the vesicle,  causing it to swell  ● Isotonic­ inside and outside have equal solute concentrations      Membrane Proteins  ● Proteins can be ​amphipathic​ (polar and charged amino acids residues are  hydrophilic and the nonpolar residues are hydrophobic)  ● Integral membrane protein: goes through the actual membrane  Week 4: 9/13­9/19  ● Peripheral membrane protein: simply bound to the membrane       Facilitated Diffusion via Protein Channels  ● Ion channels: specialized membrane channels  ● Ions move through these channels from regions of high concentration to regions  of low concentration  ● Electrochemical gradient: ions move in response to a combined concentration of  electrical gradient  ● Gated channels­ Channels that are carefully controlled  ● Passive transport is powered by diffusion      Facilitated Diffusion via Carrier Proteins  ● Carrier proteins are specialized membrane proteins that change shape during the  transport process  ● They cross through the membrane by diffusion      Pumps and Active Transport  ​ ● Active transport­ Used to transport molecules ​against electrochemical gradient  ● Needs energy to work against the gradient  ● Helps move things back to “before” conditions 


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