The spontaneous direction of a metabolic reaction is dictated by the ratio of substrate and products under equilibrium conditions (k) and under cellular conditions (q). compare the two reactions a→b and c→d. for a→b, δg˚ = –13 kj/mol. for c→d, δg˚ = 3.5 kj/mol. the cellular concentrations are as follows: [a] = 0.050 mm, [b] = 4.0 mm, [c] = 0.060 mm, and [d] = 0.010 mm. which statement below correctly describes the relationship between q and k for both reactions? are these reactions spontaneous as written under cellular conditions? (a) q > k for both reactions. both are nonspontaneous at those concentrations of substrate and product.(b) q < k for both reactions. both are spontaneous at those concentrations of substrate and product.