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Unformatted text preview: BIS103-002, Spring 08 REVIEW QUESTIONS SET 6 - 1 - Topics: Photosynthesis [Light Reactions and Reductive Pentose Phosphate Pathway (Calvin-Benson-Basham Cycle)], Amino acid breakdown, N assimilation, AA synthesis 1, Please explain as briefly as possible why the "Z" scheme of energy transfer in photosynthesis predicts a photon requirement of eight photons per mole of O 2 produced. 2. Name the similarities between oxidative phosphorylation and photophosphorylation. Name some differences. 3. How many ATPs are used for each CO 2 fixed during each of the following phases of the dark reaction in photosynthesis? a. carboxylation phase b. reduction phase c. regeneration phase 4. A wheat plant was placed in an atmosphere containing radioactive carbon dioxide ( 14 CO 2 ). After 10 seconds of photosynthesis, the plant was killed and the monosaccharide glucose was isolated. Radioactive carbon ( 14 C) was found predominantly in two of its six carbons. Indicate which carbon atoms of glucose were labeled and indicate the most probable sequence of reactions that can account for the labeling. 5. Give one example of each of the following reactions -- using specific compounds known to undergo those reactions: a. Decarboxylation of an amino acid. b. Aminotransferase (transamination). 6. When an experimental animal is administered aspartic acid labeled with 15 N, both nitrogen atoms in urea become labeled with 15 N. Outline the reactions that account for this observation. Name the enzymes that feed N into the urea cycle, but don’t name the urea cycle enzymes. 7. Name the cofactor and its corresponding vitamin commonly found in aminotransferase enzymes. Name the cofactor and its corresponding vitamin commonly found in one carbon transfers in amino acid metabolism and dTMP synthesis. 8. Write the reaction that would be catalyzed by an enzyme called carbamoyl- P:glycine carbamoyltransferase. BIS103-002, Spring 08 REVIEW QUESTIONS SET 6 - 2 - 9. Trace the path of the nitrogen atom from glutamic acid in a test tube solution...
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This note was uploaded on 03/04/2010 for the course BIS 103 taught by Professor Abel during the Spring '08 term at UC Davis.
- Spring '08