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Cell Membrane Structure and Function
Transcript of Cell Membrane Structure and Function
1. cell membrane is made up of a lipid bilayer
2. proteins embedded in this bilayer help govern what passes through the cell
How does this relate to the function of the cell membrane that we learned last week? Write down two essential components of the cell membrane that we learned yesterday if China = a living cell,
the Great Wall of China = ? Objectives Compare and contrast movement across the membrane for the following processes:
3. Facilitated diffusion
4. Active transport Semipermeable 1. What would be the characteristics of an impermeable membrane?
2. What would be the characteristics of a permeable one?
Discuss with 3 classmates for 5 minutes and write answers on whiteboards. Diffusion is the spreading of solutes from a region where the solute is more concentrated to another region where it is less concentrated. Diffusion Osmosis is the phenomenon of movement of solvent particles (in general, water) from a region of lower solute concentration to a region of higher solute concentration. - CAREFUL! This is tricky! Osmosis In facilitated diffusion the movement of substances is also in favor of their concentration gradient but the substances move bound to specific molecules that act as “permeabilizers”, i.e., facilitators of their passage through the membrane. Facilitated diffusion Movement of molecules across the membrane AGAINST their concentration gradient - requires energy and proteins to facilitate transport Active Transport Diffusion Facilitated diffusion Diffusion Active Transport Facilitated diffusion Facilitated diffusion Active Transport Facilitated diffusion Movement of solutes across membrane with concentration gradient without the help of proteins in membrane Movement of solutes across membrane with concentration gradient with the help of proteins in membrane Movement of solutes across membrane with concentration gradient Movement of solutes across membrane with concentration gradient with the help of proteins in membrane Movement of solutes across membrane against concentration gradient with the help of proteins in membrane Movement of solutes across membrane with the help of proteins in membrane 1. Complete worksheet
-Venn Diagram under "osmosis" heading
2. Fill out graphic organizer provided in order to make sense of differences in transport processes.
3. Study graphic organizer for activity at the beginning of class tomorrow. For Homework Let's warm up! A couple of reminders for your studying before we take notes:
-Red indicates key concepts you should be able to address when you study
-Green indicates vocabulary you should tune in on
-Worksheets will be collected tomorrow after class http://arbl.cvmbs.colostate.edu/hbooks/cmb/cells/pmemb/osmosis_eg.html Let's Practice! concentration gradient: substance molecule moves from an area of high concentration to an area of low concentration Create your own example using your whiteboard! Look over definitions. UNDERLINE the similarities between the two, and BRACKET the differences. 1. Look at concentrations of extracellular and intracellular conditions
2. Identify type of molecule crossing. Small? Charged?
3. Is the molecule moving with or against concentration gradient?
4. Identify type of transport Ways to attack future problems
according to transport type Cell membrane transport Diffusion Osmosis Facilitated Diffusion Large solutes facilitated by proteins concentration gradient energetically favored concentration gradient Solutes energetically favored solvents (usually water) energetically favored against concentration gradient Active transport concentration gradient (TOWARDS solutes) Large solutes facilitated by proteins requires energy PULSE CHECK! On whiteboards...
1. Without looking at your notes, give your best example for diffusion.
2. Fill in the blank: Osmosis is the diffusion of ____________ to areas with _____________________.