biochem-final-2 - Chemistry and Biochemistry 153A Winter...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Chemistry and Biochemistry 153A Winter 2009 Final Exam Instructions: You will have 3 hours to complete this exam. You may use a pencil (recommended) or blue or black ink pen to write your answers. Other color inks will not be graded. Only answers on the answer sheet, in the indicated space, will be graded; writing anywhere else will be ignored. Be sure to write your name on the answer sheet. Do not write in the score boxes on your answer sheet; you will be docked points if you do. For answers with a word or sentence limit, words beyond this limit will not be read or graded. For short- or multi-answer questions, including irrelevant or wrong information or selections in your answer will cause you to lose points. Write legibly. If the grader cannot read your answer, you won’t get credit. Items you may have on your desk: - non-programmable scientific calculator, without its case or cover - writing utensil(s) - student ID ALL other items must be placed into a bag, which must be zipped up or closed and pushed completely under your chair. No hats or earphones allowed. (Head scarves are fine.) If you need to use the restroom, bring your exam to a proctor. Only one student may use the restroom at a time. If you continue to write after ‘time’ is called, your exam will be taken and docked 10 points. Questions are printed front and back – don’t miss any! 1/12
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Answer Sheet 1 (Green) 1. (1 pt) Write your exam ID in the blank at the upper right of your answer sheet. 2. (5 pts) Which of the reactions of a metabolic pathway would you expect to be regulated? List all that apply: a. the 1 st committed step of the pathway b. the last step of the pathway c. a highly spontaneous reaction d. a rate-limiting reaction e. a reaction in which [products]/[reactants] is close to K eq f. a very fast reaction (relative to others in the pathway) g. a reaction with a large, positive ΔE°' h. a reaction involving a phosphoryl transfer from phosphoenolpyruvate i. a reaction that is used in the reverse pathway 3. (3 pts) The reaction X → Y has ΔG°' = -3.7 kJ/mol. If [Y] > [X], which of the following can be concluded? a. the reaction will be spontaneous in the direction written b. the reaction will be spontaneous in the reverse direction c. the reaction is near equilibrium d. the reaction is at equilibrium e. none of the above 4. (2 pts) What metabolite is the first intermediate common to the breakdown of proteins, polysaccharides, and fatty acids? 5. (3 pts) Given the following reactions: A B C enz 1 enz 2 G°' = -28.2 kJ/mol G°' = +5.3 kJ/mol Explain why the conversion of B→C would be spontaneous in the cell (30 words or less). 6.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 12

biochem-final-2 - Chemistry and Biochemistry 153A Winter...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online