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Kaplan Qbank USMLE



Author5 Posts
  #1

.............Delta G

v <--> w -4.0
w <--> x +0.4
x <--> y -3.4
y <--> z +5.7

From the values of Delta G above, 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

  #2

It's W or Y, but I'm not sure how to work ouut which. I'll go for Y, because delta G for Y<-->Z is very positive.

  #3

ans. W
Because v--->W ,it has max -ve delta G.

___________________
focussed

  #4

I have no idea about this, what does negative, positive delta G mean ?

Any explanation ?

  #5

Delta G is the Gibbs free energy. It determines whether a particular reaction will proceed stontaneously or not under those conditions. If delta G is negative, it will. The value does not tell you how quickly a reaction will proceed (i.e. a reaction with a highly negative delta G will not necessarily proceed faster than one will a less negative value).

That's all I can remember. Sorry!







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