2006%20mideterm1key - Name Student ID The first Midterm...

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Name Student ID 1 The first Midterm Exam BIBC 102, Metabolic Biochemistry Friday, January 27, 2006 a. This exam has 6 pages (including this cover page); please check whether your exam is complete before you start to answer questions. b. You should write your name and initials in the space provided on each page. c. Please write your answers only in the spaces (which are more than enough) provided on each page. We will not grade anything written outside of the provided spaces such as the back of the pages. d. The exam has a total of 100 points. You have 50 minutes total to answer the questions. The exam ends at 4:50 pm. Good Luck!
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Name Student ID 2 1 . The following questions are based on the three reactions shown below (10 points total): a). Which is the most thermodynamically favorable reaction? ( 2 points ) and explain why ( 4 points ) Reaction A. The Pi group is a good leaving group and the other product enol form of Pyruvate is converted to the keto form, which releases a lot free energy. b). Which is the least thermodynamically favorable reaction? ( 2 points ) reaction B d) The G for the reaction A is y, what is the equilibrium constant for the reaction ( 2 points )? G is the activation energy and Keq cannot be calculated from G O C O CH 2 - O P O - O O - H2O O C O - O CH 3 HO P O - O O - CH 3 C O O CH 3 H 3 C C O OH CH3OH CHOH CH 2 OH H 2 C O P O - O - O CHOH CH 2 OH CH 2 OH HO P O - O - O + + Reaction A Water + + Reaction B + + Water Reaction C
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Name Student ID 3 2. ATP (10 points total) a) Which of the following is not part of the ATP molecule: A) base; B) sugar; C) flavin ; D) phosphate, E) ester bond ( 2 points ) b)
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