BIS103ProblemSet5

BIS103ProblemSet5 - BIS103, Spring 10 REVI EW QUESTIONS SET...

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BIS103, Spring 10 REVIEW QUESTIONS SET 5 - 1 - Topics: Photosynthesis [Light Reactions and Calvin Cycle [also known as Reductive Pentose Phosphate Pathway and C3 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 to undergo these 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. What does ketogenic and glucogenic mean?
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BIS103, Spring 10 REVIEW QUESTIONS SET 5 - 2 - 9. Write equations for the enzyme-catalyzed reactions that incorporate inorganic nitrogen into an organic molecule. Name the enzyme. 10.
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BIS103ProblemSet5 - BIS103, Spring 10 REVI EW QUESTIONS SET...

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