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29. Which statement is correct about the Michaelis-Menten constant, Km, for the kinetic mechanism below?

(A) Its numeric value has the units of .
(B) Its defined as .
(C) It is approximately equal to the dissociation constant for the enzyme-substrate complex to E + P.
(D) The value of Km is constant for an enzyme regardless of the specific substrate molecule used to determine it.
(E) It is numerically equal to the substrate concentration required to achieve one half the maximum velocity.