Tuesday exam 2 with answers-1

Tuesday exam 2 with answers-1 - Biochemistry 415/515 2008...

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Biochemistry 415/515 2008 Name ________________________ February 19, 2008 uniqname________________________ Biochemistry 415/515 Exam 2 of 4 100 points total Instructions: 1. Please put your name on each page of the exam, your uniqname on the first page, and fill out the scantron sheet with your student ID number, name, and uniqname. 2. Read through the exam first. Answer the immediately obvious questions when you can. Put a question mark by the ones you’re not sure about. 3. Raise your hand to ask questions. Often you may be focusing on a phrase that can be stated differently. 4. If you’re still here after 60 minutes, get up and walk around for 2 minutes. Then start doing the test from back to front.                                                                               Section A. Multiple choice (76 points-2 points per question). Choose the most appropriate answer. 1. Which of the following compounds is D-ribose 2. Sucrose is a disaccharide made up of a. One glucose unit and one galactose unit b. Two galactose units c. Two glucose units d. One glucose unit and one fructose unit Exam 2 Page 1
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Biochemistry 415/515 2008 Name ________________________ February 19, 2008 uniqname________________________ 3. Which statements are/is true about the above image? a. It shows an O-glycosidic linkage b. Both sugars can exist individually as aldoses in their open conformations c. This linkage is commonly found in starches allowing them to be planar d. The circled carbons are the anomeric carbon e. A and B only 4. What type of bond connects the two sugars in the above question a. It shows an α-1,4 glycosidic linkage b. It shows a β-1,4 glycosidic linkage c. It shows a β-6,2 glycosidic linkage d. It shows an α-6,2 glycosidic linkage e. None of the above 5. Which of the following are/is true about carbohydrates on the surface of cell membranes? a. Proteins such as selectins bind to these carbohydrates for cell to cell communication b. The presence and absence of different types of polysaccharides on red blood cells determine your bloodtype (A, B, O etc) c. Viral proteins often bind to cells to achieve cell type specificity d. All of the above 6. What makes the hydrolysis of ATP to ADP + Pi so favorable? a. There is less electrostatic repulsion in ADP than in ATP b. There are more resonance structures for with Pi released c. Hydration can stabilize ADP and Pi to a greater extent than ATP d. e. 7. Which of the following are/is true about triose phosphate isomerase (aka. TIM and TPI) a. Kinetically, it is nearly perfect, meaning its rate of catalysis is limited by the rate of diffusion of substrates b. It catalyzes the phosphorylation of the intermediate oxaloacetate c. It suppresses an undesired reaction by closing its lid until the reaction is complete d. A, B and C e. 8. Which of the following is NOT true about the reaction catalyzed by glyceraldehyde 3-
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Tuesday exam 2 with answers-1 - Biochemistry 415/515 2008...

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