[Right Wing Professor]

delG = delH -T*delS

S in that equation is the system entropy. There is also the entropy of the surroundings. The entropy change in the surroundings is -q_rev/T, and since the reversible heat at constant pressure equals the enthalpy change Delta H, DeltaH = -T DeltaS_surr. So DeltaG = -T(S_surr+S_sys)

[spunkets]

You're right. I shouldn't have said dS isn't important, but that entropy decreases in biological systems are always accompanied by entropy increases in the surroundings, the deltaH term in the Gibbs free energy.

DeltaG = -T(S_surr+S_sys)