試題詳解

19.Enzyme A can act on substrate S and substrate T and follows simple MichaelisMenten kinetics. The Michaelis constant Km of enzyme A for substrate S is Km^S =2 mM, and the rate constant k^s is 5X10³ sec¹. For substrate T, KmT = 5 mM, and
k^T is 2.5X10⁴ sec¹. Which substrate exhibits greater catalytic efficiency?
(A) S
(B) T
(C) Enzyme A uses S and T with the same catalytic efficiency.
(D) cannot be determined due to insufficient information.

(E) The result would change if the enzyme's conditions or substrate concentrations varied.