Describe the roles of the following amino acids in the catalytic mechanism: glu117, tyr409, and asp149. list all of the following that apply: general acid/base catalysis (gabc), covalent catalysis, electrostatic stabilization of transition state.

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a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.