xm2key - Page 1 of 4 NAME_ 1. (45 pts) Your roommate, a...

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Page 1 of 4 NAME_____________________________ 1. (45 pts) Your roommate, a Sanskrit major, finds the figure on the previous page (tear it out) under your bed and asks you to explain it. a. What process does the dark circle of arrows in the center represent? This is the Krebs or Citric Acid or Tricarboxylic Acid Cycle b. Where does the pyruvate at the top come from? Start from the potato you had for dinner. No need for chemical structures. Discuss the major stages of the process so your roommate has a reasonable understanding of what is happening Potato has starch which is a polymer of glucose Starch is degraded in the mouth and small intestine into the individual molecules of glucose Glucose is absorbed into the blood stream in the small intestine Glucose then crosses the cell membrane into the cell In the cell it is converted, through the reactions of glycolysis into pyruvate. c. Billions and billions of molecules of pyruvate are produced yet in principle, the process in this figure(see part a) could function, although slowly, if there were only a single molecule of oxaloacetate (see 11 o’clock on the circle). Explain how this is possible. The oxaloacetate (OAA) which has four carbons, is simply a carrier of the acetyl CoA through the process. The two are joined into a six carbon compound and in the course of the cycle, two CO 2 are broken off leaving a four carbon compound. This molecule is reorganized and becomes oxaloacetate again, which binds another
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This note was uploaded on 08/01/2008 for the course MCB 11 taught by Professor Alper during the Spring '06 term at University of California, Berkeley.

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xm2key - Page 1 of 4 NAME_ 1. (45 pts) Your roommate, a...

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