ReviewEx2-08 - BIOU111 - General Biology 1 Review Exam 2...

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BIOU111 - General Biology 1 Fall 2008 Review – Exam 2 This is a list of Concepts and Terms you should review for your second exam (Wednesday, October 29, 2008). This list is not meant to be all inclusive but rather should be used as a guideline to help you organize your studying. Chap. 4 – Cell Structure Cytoskeletal elements – microtubules (cilia, flagella, centrioles), microfilaments (actin), intermediate filaments Chap. 5 – Membrane Structure and Function Fluid Mosaic Model – phospholipid bilayer in which protein molecules are either partially or wholly embedded, cholesterol, glycocalyx Proteins: channel, carrier, cell recognition, receptors, enzymes, adhesion Animal cells - membrane junctions (gap, tight, desmosomes (adhesion) Extracellular matrix Plant cell walls - plasmodesmata Plasma membrane permeability - differentially (selectively) permeable Passive transport - no ATP requirement, molecules follow concentration gradient Active transport - requires carrier protein and ATP Crossing Plasma Membrane Diffusion - follow conc. gradient, influenced by size of gradient, temp., charge, distance Osmosis - diffusion of water across a differentially permeable membrane due to concentration differences, Osmotic Pressure, colligative property, tonicity Isotonic solution - solute and water concentrations both inside and outside the membrane are equal Hypertonic solution - solution with a higher concentration of solute than the solution on the other side of the membrane. Cells placed in a hypertonic solution will shrink (crenation, plasmolysis) Hypotonic solution - solution with a lower concentration of solute than the solution on the other side of the membrane. Cells placed in a hypotonic solution will swell (lysis, hemolysis, turgor pressure) Facilitated diffusion - carrier proteins combine with certain molecules which are then transported through the membrane, saturation
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This note was uploaded on 11/02/2008 for the course BIOU 111 taught by Professor Pott-santone during the Fall '08 term at Northeastern.

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ReviewEx2-08 - BIOU111 - General Biology 1 Review Exam 2...

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