Modern Biology HW 2 Ch 6 9 40 pts Due Wednesday October 17th Name Group 1 5 pts Rank the following in order of permeability through bilayers from highest to lowest 1 Glucose Glycerol O2 Na Water O2 Water Glycerol Glucose Na 2 a Describe the difference between a saturated and unsaturated fatty acid 2 pts unsaturated has double bonds b A lipid bilayer containing more less saturated fatty acids would have a higher permeability because of the presence of more double bonds gaps fluids 2 pts 3 1 pt Which of the following increases the strength of the hydrophobic interactions in lipid bilayers and thus makes them less permeable to polar molecules a the presence of double bonds b increasing temperature c removing cholesterol d increasing length of the hydrocarbon chains 4 3 pts Cystic fibrosis is a common genetic disease that is caused by defects in a membrane protein that allows chloride ions Cl to move across the plasma membrane Researchers found that presence of the membrane protein CFTR in a bilayer led to an increase of electric current across the membrane upon addition of chloride ions Lack of CFTR saw no electric current through the membrane despite presence of chloride ions What kind of channel is CFTR What type of diffusion is this and is it an active or passive process Chloride ion channel facilitated diffusion passive 5 Fill out this chart about organelles in eukaryotic cells 9 pts Organelle Plasma Membrane Animal Plant or Both Both Single Double or No membrane single Cell Wall Nucleus Ribosome Rough ER Smooth ER Lysosome Peroxisome Vacuole Mitochondria Chloroplast Cytoskeleton Plant Both Both Both Both Animal Both Plant Both Plant Both None Double None Single Single Single Single Single Double Double None Function limit to 2 3 words Maintains intracellular environment Structural support Genetic information Protein synthesis Protein synthesis Lipid synthesis Digestion recycling Oxidation Storage ATP production ATP production photosynthesis Structure support movement 6 Upon synthesis the new protein enters the cis face of the golgi organelle and exits from the trans face to be secreted from the cell 3 pts 7 1 pt Microtubules intermediate filaments and microfilaments are made of respectively a actin keratins and other nonpolar filaments and tubulin b and tubulin lamins myosin c actin myosin and tubulin d and tubulin keratins and other nonpolar filaments actin 8 4 pts Compare and contrast desmosomes and tight junctions Be detailed about structural components for each and how they are similar and different 9 5 pts a Fill in the blanks regarding ATP hydrolysis ATP H2O ADP inorganic phosphate 7 3 kcal mol ATP b What is the primary difference between ATP and its hydrolyzed form No of phosphates c Why is this reaction exergonic ADP Pi electrons have less potential energy 10 4 pts Match the 4 steps of cellular respiration with its function and list where the step occurs Match Step with Function d Step c Glycolysis cytosol b Electron Transport Chain a Pyruvate Processing Mitochondria inner membrane Mitochondria matrix Citric Acid Krebs cycle Where does the step take place in the cell Mitochondria matrix Function a Pyruvate oxidized to acetyl CoA b Oxidation reactions that lead to ATP production c glucose broken down to pyruvate d Acetyl CoA oxidized to CO2 11 1 pt Why is the electron transport chain also called oxidative phosphorylation a Electron carriers are phosphorylated before being oxidized b As electrons are transferred a carrier is oxidized The process of electron transfer assists in setting up the electrochemical gradient that drives phosphorylation of ATP from ADP c Electron transport deals with transport of electrons to carriers of subsequently lower and lower energy levels The phosphorylation provides the energy for the reactions to take place d Water is oxidized and ATP is produced by phosphorylation of ADP
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