BCH/PPA 503 1st hour exam February 12, 1998 Name ___________________

 

 

  1. Diagram the differences in CO2 fixation between C3, C4 and CAM plants. Describe the relative advantages and disadvantages of these three systems. (20 points)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  1. Describe the carboxylase and oxygenase reactions of RUBISCO including intermediate structures. What are the prospects of changing the relative specificity of the enzyme for CO2 compared to O2? (15 points)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  1. Give an example (structure) of 3 monosaccharide derivatives and how they are formed. Briefly mention their function in plants. (10 points)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  1. Describe the important properties of H2O that make it such a useful biological solvent. (10 points)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  1. Give an example of a high-energy structure of importance in biochemistry. How can the energy of this structure be harnessed to promote an otherwise unfavorable biochemical reaction? (10 points)

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  2. Give an example of a disaccharide and how it is formed from monomers. What is the nature of the bond between the 2 monosaccharides? (10 points)