nbme1 form1 plz explain ..v-w-x-y.. - docmp
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nbme1 form1 plz explain ..v-w-x-y.. - docmp
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09-28-2010, 05:31 PM
Which compound in the overall metabolic pathway VWXYZ will accumulate in the largest amount at equilibrium?
g0 --------------------------------------------------------------------------- option-a). VW -4.0 ? option-b). WX +4.0 ? option-c). XY -3.4 ? option-d). YZ +3.5 ?
09-28-2010, 05:33 PM
sorry ..values r..
Which compound in the overall metabolic pathway VWXYZ will accumulate in the largest amount at equilibrium? g0 --------------------------------------------------------------------------- option-a). VW -4.0 ? option-b). WX +0.4 ? option-c). XY -3.4 ? option-d). YZ +5.7 ? plz explain this concept..seeing for the 1st time!
09-29-2010, 06:20 AM
------------ ΔG0′
V ↔ W = – 4.0 W ↔ X = +0.4 X ↔ Y = – 3.4 Y ↔ Z = + 5.7 From the values of ΔG0′ given in the table, which compound in the overall metabolic pathway V ↔ W ↔ X ↔ Y ↔ Z will accumulate in the largest amount at equilibrium? A) V B) W C) X D) Y E) Z This is biochemistry question, in order to answer correctly we need to understand the direction of the reaction(reverse or forward ) based on ΔG0 value (ΔG0=0 , less than 0, more than 0) A state where ΔG = 0 is called equilibrium, and this is the state where the reaction in both the forward and reverse directions take place at the same rate, thus not changing the net effect on the system. If ΔG is less than 0 then the reactants should convert into products (signifying a forward reaction) if ΔG more than 0 then it is known that the reverse reaction is favored to take. V ↔ W = – 4.0 and X ↔ Y = – 3.4---->favored reaction W ↔ X = +0.4 and Y ↔ Z = + 5.7--->disfavored reaction W ↔ X = +0.4 is close to zero, neither the forward nor the reverse reaction prevails. At equilibrium, I think D) Y is the answer. Not sure, open to discussion  |
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