C485ExamIII

C485ExamIII - C485 Exam III Fall `09 Name_ Legible please!...

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C485 Exam III Fall ‘09 Name___________________ Legible please! Do not use acronyms. Use structures whenever they are asked for, or appropriate. Your explanations should be brief . Overly lengthy answers with irrelevant or erroneous material will receive deductions. GOOD LUCK 1. (8 Pts) What are the requirements for biological nitrogen fixation in terms of electrons/nitrogen molecule and ATP consumed /nitrogen molecule fixed. Does the reaction require the same amount of electrons as chemical fixation? If not, how do these numbers differ and why are they different? 2. (8pts) Name the cofactor required for hydroxylation of phenylalanine. Draw the structures of the three commonly observed forms of this cofactor. How are they related? 3. (6pts) What are the two major multicarbon degradation products of tryptophan? (structure or name acceptable) 4. (6 pts) Which of the following are intermediates in the pathway for the biosyntheiss of both phenylalanine and tryptophan? circle your answer(s) (a) anthranilate (b) chorismate (c) shikimate
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C485ExamIII - C485 Exam III Fall `09 Name_ Legible please!...

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