Practice Final

4 x 1025 assuming standard conditions for the

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Unformatted text preview: orbic acid and ATP synthesis, could the oxidation of 1 mol of ascorbic acid provide enough energy to synthesize 4 mol ATP? Support you answer with a calculation. (ii) (4 points) Oxidative phosphorylation is occurring in isolated mitochondria using ascorbic acid as electron donor. The mitochondria are suspended in a solution buffered at pH = 6.0. If the electrical charge difference across the IMM is 0.18 V (inside negative) and the matrix pH = 7.0, calculate how much energy is produced when 3 mol of H+ enter the matrix via the ATPase. Page 9 Question #4 (18 points) Bacteria carry out SLP reaction sequences that plant and animal cells do not. (a) (12 points) Complete the following bacterial SLP scheme adding structures and 1-word (semi) systematic enzyme names in the spaces provided. Abbreviations may be used for vitamin containing groups or molecules and for any molecules lacking a vitamin-derived group if the molecule consists of > 5 C atoms. O CH3CH2C O - + + C O Systematic enzyme name + + Systematic enzyme name Enzyme bound intermediate + ATP Page 10 (b) At some point in the reaction scheme from part (a) a high energy phosphorylated intermediate should appear. (i) (2 points) Write the reaction for the imaginary hydrolysis of this molecule showing all structures. (ii) (4 points) The main reason that the hydrolysis reaction yields a large amount of energy is because bonding in the products is better stabilized by resonance than bonding in the reactants. If you were going to illustrate this point, you would draw some RELEVANT resonance structures. Draw two resonance structures for the reactants that you would use to illustrate why bonding in the products is better stabilized by resonance than bonding in the reactants. Page 11 Question #5 (28 points) Triacylglycerols (fats) can be used to make ATP following their digestion by lipases which catalyze the hydrolysis of ester bonds lipids. O O CH3 (CH2)14 C O CH2 O CH3 (CH2)14 C O CH O CH3 (CH2)14 C O CH2 3 Fatty acid CH3 (CH2)14 + CO - + 3 H 2O L ipase HHH Glycerol HO C C H Fat (triacylglycerol) C OH OH H Fatty acids are linked to CoA and converted to Acetyl CoA. The following reaction sequence (called β-oxidation is used (Yes, you will not actually “learn...
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