How can a thermodynamically unfavorable reaction be made thermodynamically favorable?

Question

vera_ewing · Answer

@aaronq Can you please help me?

vera_ewing · Answer

A.	By coupling it with a series of favorable reactions such that the reactions add up to produce an overall reaction with G° = 0.
 		B.	By coupling it with a series of unfavorable reactions such that the reactions add up to produce an overall reaction with a negative G°.
 		C.	By coupling it with a series of favorable reactions such that the reactions add up to produce an overall reaction with a positive G°.
 		D.	By coupling it with a series of favorable reactions such that the reactions add up to produce an overall reaction with a negative G°.

vera_ewing · Answer

I' m pretty sure the answer is D...

aaronq · Answer

couple it to reactions to make it favourable, it's the essence of chemistry in biological systems

aaronq · Answer

favourable reactions occur when dG<0

vera_ewing · Answer

Oh ok good so it's D. Thank you so much for explaining it! :) @aaronq

aaronq · Answer

no problem!