Final_Exam_questions

Final_Exam_questions - I will choose all the longer answer...

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I will choose all the longer answer questions for the final from this set of questions. I will not post the solutions and I will not tell you the answers. And I will change the numbers in the calculations. I reserve the right to slightly modify the wording of the questions. I may also combine the shorter questions. These questions will comprise a minimum of 50% of the marks on the final exam. 1. Draw the D-aldohexose of your choice in both the linear and cyclized form. The cyclized form should be the alpha anomer. They should be the same sugar. 2. Describe the difference between amylase, amylopectin, glycogen and cellulose, draw an a1,4 linkage an a1,6 link and the b1,4 linkages and explain the differences in function of the 4 polymers. What is common to all 4? 3. Draw an AT base pair. The order of the bases matters. 4. Calculate the pH of a buffer made by combining 1.35 mol H 3 PO 4 and 2.95 mol NaOH in 0.50L of aqueous solution. pKa1 = 2.12 pKa2 = 6.86 pKa3 = 12.4 5. The internal pH of a muscle cell is 6.8. Phosphate in the muscle cell, 10 mM, can exist in 4 forms; the pKa’s are 2.15, 6.78, 12.4. At the pH of a muscle cell, how much of each form of phosphate (H 3 PO 4 , H 2 PO 4 - , HPO 4 2- and PO 4 3- ) is present? You need to calculate this for each form, some will be present at a very much higher concentration than others. 6. Draw 2 strands of an anti-parallel beta sheet. The sequence of the peptide is (Arg- Val)n. Draw the top view to show the H bonding pattern and the side view to show the arrangement of the side chains. Describe how 2 sheets, not strands, would interact in aqueous solution.
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7. The graph below shows how the transport of glucose into endothelial cells and pericytes in the retina depends on the concentration of Na+ in the extracellular medium. Describe the sodium dependence of glucose transport in each cell type What would happen to the glucose flux in the 2 cell lines if a sodium ionophore was added to the cell culture? 8.a.(9) Draw a schematic picture of a cell membrane. Make sure to indicate the position of the charged groups and the hydrocarbon groups on the membrane components. Include an integral membrane protein and a peripheral membrane protein. Indicate the position of the polysaccharides on the membrane proteins and the glycolipids. b. (2)Are the lipids symmetrically distributed? c. (2) Are the membrane lipids the same in all cell types? d. (2) How do newly synthesized lipids get to the outer leaflet of the membrane? [Na+] glucose flux pericytes Endothelial cells
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9. Very small tissue samples were taken painlessly from Santa’s reindeer and analyzed for fatty acid content. Samples were taken near the hooves and at the thigh. Which samples contained a larger percentage of unsaturated fats? Explain your answer in 1 sentence. 10.
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This note was uploaded on 07/07/2010 for the course CHEM 237 taught by Professor Elisabethdaub during the Fall '10 term at Waterloo.

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Final_Exam_questions - I will choose all the longer answer...

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