3. An enzyme follows Michaelis-Menten kinetics with Vmax = 120 μM min⁻¹ and Km = 30 μM. What is the initial rate v0 when the substrate concentration is [S] = 30 μM? (A) 15 μM min⁻¹ (B) 30 μM min⁻¹ (C) 60 μM min⁻¹ (D) 90 μM min⁻¹ (E) 120 μM min⁻¹

2. For a reaction at constant pressure, the standard Gibbs energies at two temperatures are: ΔrG°(298K) = −12.0 kJ mol⁻¹, ΔrG°(348K) = −5.0 kJ mol⁻¹. Using the Gibbs-Helmholtz equation:what can be concluded about the sign of ΔrH°? (assuming that ΔrH° does not depend on T) (A) ΔrH° = 0 (B) ΔrH° ＞ 0 (endothermic) and ΔrH° is around +54 kJ mol⁻¹ (C) ΔrH° ＜ 0 (exothermic) (D) Cannot be inferred from ΔrG°(T) (E) ΔrH° ＞ 0 (endothermic) and ΔrH° is around +5.4 kJ mol⁻¹

3. An enzyme follows Michaelis-Menten kinetics with V_max = 120 μM min⁻¹ and K_m = 30 μM. What is the initial rate v₀ when the substrate concentration is [S] = 30 μM?
(A) 15 μM min⁻¹
(B) 30 μM min⁻¹
(C) 60 μM min⁻¹
(D) 90 μM min⁻¹
(E) 120 μM min⁻¹

相關試題

相關試卷