Midterm1W07 - Name 1 Chemistry Biochemistry 153C Winter 2007 1st MIDTERM EXAMINATION 2 February 2007(80 points 3 pages 50 minutes PLEASE READ EACH

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Chemistry & Biochemistry 153C Winter 2007 1st MIDTERM EXAMINATION 2 February 2007 (80 points, 3 pages, 50 minutes) PLEASE READ EACH QUESTION VERY CAREFULLY! 1. (20 total points) (part a) (15 points) Polyhydroxybutyric acid is a storage form of excess carbon in many microorganisms. The enzyme polyhydroxy-butyrate depolymerase produces D-beta- hydroxybutyrate. Describe how a microbe would be able to convert D-beta- hydroxybutyrate to CO 2 and H 2 O. How many ATP equivalents are generated by the complete metabolism of D-beta-hydroxybutyrate? Show your logic for full credit. You may use either names or structures. Indicate any cofactors by name. No e- pushing required! OH O H CH 3 O * H n OH O OH CH 3 H n Polyhydroxybutyric acid D- β -hydroxybutyrate (part b) (5 points) Microorganisms metabolizing D-beta-hydroxybutyrate produce acetone as a byproduct (the acetone is not further metabolized). Show how this might occur. How would this affect the calculation of net ATPs in part (a)?
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This note was uploaded on 08/26/2011 for the course CHEMISTRY Chem 153C taught by Professor Cathyclarke during the Spring '11 term at UCLA.

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Midterm1W07 - Name 1 Chemistry Biochemistry 153C Winter 2007 1st MIDTERM EXAMINATION 2 February 2007(80 points 3 pages 50 minutes PLEASE READ EACH

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