CHEM114B_Practice Midterm 2

CHEM114B_Practice Midterm 2 - Chem/Biochem 114B Mid-Term...

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Chem/Biochem 114B Mid-Term 2009 Last Name, First Name Student ID and Section Number Page 1 Chem/Biochem 114B Midterm Exam February 6, 2009 Exam Version ‘A’ — Mark in ‘Test Form’ on Scantron Write your name and student ID on EVERY page of the exam Fill in the bubbles for your student ID on the scantron. Replace the alphabetical letter in your student ID with the number ‘1’ (e.g., A = 1, U = 1) Questions 1-25 Multiple Choice 75 points Questions 26-31 Short Answer 36 points 1 1 1 p o i n t s
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Chem/Biochem 114B Mid-Term 2009 Last Name, First Name Student ID and Section Number Page 2 Questions 1-25 (3 pts. each): Multiple choice 1. (3pts.) Which of the following is an example of an oxidation reaction? A ) - O 2 C CH 2 2 CO 2 - FAD CC CO 2 - - O 2 C H H FADH 2 + + B) CO 2 - C CH 3 H H 2 N 2 - C 3 NH 2 H C ) A l a - S e r + H 2 O ĺ Ala + Ser D) All of the above E) None of the above Answer: A 2. (3 pts.) Consider the following metabolic reaction: Succinyl-CoA + Acetoacetate o Acetoacetyl-CoA + Succinate ' G °' = ±1.25 kJ/mol The ' G °' for the hydrolysis of Succinyl-CoA is ±33.9 kJ/mol. What is the ' G °' for the hydrolysis of Acetoacetyl-CoA: Acetoacetyl-CoA o Acetoacetate + CoA A) ±32.65 kJ/mol B) +32.65 kJ/mol C) ±35.15 kJ/mol D) +35.15 kJ/mole E) none of the above Answer: A 3. (3pts.) Metabolic processes are regulated by A) transcriptional regulation of the amount of enzyme. B) allosteric control of enzyme activity. C) Accessibility of substrates by compartmentalization. D) a and b. E) a, b, and c. Answer: E 4. (3pts.) What two 3-carbon molecules are generated by the cleavage of fructose-1,6-bisphosphate? A) glyceraldehyde-3-phosphate and 3-phosphoglycerate B) glyceraldehyde-3-phosphate and dihydroxyacetone phosphate C) pyruvate and phosphoenolpyruvate D) enolase and 2-phosphoglycerate E) glyceraldehyde-3-phosphate and pyruvate Answer: B
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Chem/Biochem 114B Mid-Term 2009 Last Name, First Name Student ID and Section Number Page 3 5. (3 pts.) Consider the following metabolic reaction of oxidation of glyceraldehyde 3-phosphate (GAP) to a carboxylic acid: ' G °' = ±50 kJ/mol. This reaction is: A) always exergonic and can never proceed in the opposite direction. B) favorable under standard conditions. C) not favorable under standard conditions. D) spontaneous when [GAP] is high. E) None of the above Answer: B 6. (3pts.) What is the function of a thioester intermediate such as the one formed from GAP? A) It speeds up the actual reaction so that more product can be made. B) The thioester shifts the equilibrium of the first stage of the reaction. C) The thioester allows the two-step reaction to be coupled so the second reaction, the energetically unfavorable phosphorylation, can proceed. D) The thioester intermediate induces a conformational change that alters the enzyme specificity. E) The thioester prevents the formation of metabolically unfavorable side products.
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CHEM114B_Practice Midterm 2 - Chem/Biochem 114B Mid-Term...

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