Lecture-5 - All biological topics, and those of most...

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Unformatted text preview: All biological topics, and those of most sciences, are inter-related; nothing is discrete. This means that new material builds on that which has already been covered. This means that tests are cumulative. You cannot just forget what you have already learned. Test 2 and the Final Exam are cumulative (based on what has been covered from Sept 8 to an indicated date). Note regarding subsequent tests Chapter 5: Membranes and Transport Note: ALL OF CHAPTER 5 is TESTABLE MATERIAL Learning objectives Define: selective permeability, diffusion, facilitated diffusion, gradient, channel protein, carrier protein, integral protein, peripheral protein, active transport, uniport, symport, antiport, osmosis, hypertonic, hypotonic, isotonic, exocytosis, endocytosis. [ Knowledge ] Describe the structure and common components, of eukaryotic membranes. [ Knowledge, Comprehension ] Describe the functions of the eukaryotic plasma membrane. [ Comprehension ] Describe how the fluid mosaic model fits what is known about the plasma membrane, with respect to membrane structure/characteristics. [ Comprehension ] Explain how the plasma membrane structure provides selective permeability. [ Comprehension ] Compare and contrast passive and active transport across eukaryotic membranes, providing (and/or correctly identifying) examples of different transport mechanisms. [ Comprehension, Analysis ] Describe exocytosis and endocytosis, and the cellular processes/situations in which these processes would occur. [ Comprehension ] Describe the factors affecting membrane fluidity. [ Comprehension ] Predict the effects on the membrane/cell properties with changes in membrane fluidity. [ Application ] List and describe the key roles/functions of membrane proteins. [ Knowledge, Comprehension ] Describe osmosis, discussing how tonicity influences this process. [ Comprehension ] Describe the importance of osmoregulation in organisms. [ Comprehension ] Correctly predict the flow of a particular substance (including gases, ions, small organic molecules, large organic molecules, water) along its gradient (concentration and/or electrochemical), provided information about relative solute concentrations on either side of a selectively permeable membrane. [ Comprehension, Application ] Predict the effects on cellular processes if a particular membrane component is defective/damaged. [ Application, Analysis ] Internal Membranes and Plasma Membrane Figure 10-1a Molecular Biology of the Cell ( Garland Science 2008) Plasma (Cell) Membrane EM of red blood cell Membranes and membrane transport Bilayer = two layers. Each layer known as a monolayer Membrane Functions 1. Barrier to water-soluble (polar) molecules, charged molecules and large molecules Regulates transport in and out of organelle or cell 2. Separate inside from outside *** different environments MUST be maintained*** Intra- vs extracellular environments Inside organelle vs cytosol...
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This note was uploaded on 01/04/2012 for the course BIOLOGY 1000 taught by Professor Rebeccajubis during the Fall '11 term at York University.

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Lecture-5 - All biological topics, and those of most...

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