Which statement is correct about the Michaelis-Menten constant, Km, for the kinetic mechanism below? A) It is numerically equal to the substrate concentration required to achieve one half the maximum velocity. B) Its defined as Km= k1/(k−1+ k2). C) It is approximately equal to the dissociation constant for the enzyme-substrate complex to E + P. D) The value of Kmis constant for an enzyme regardless of the specific substrate molecule used to determine it. E) Its numeric value has the units of moles− 1 .

The Michaelis-Menten constant, K m , is defined as the substrate concentration at which the reaction velocity is half of the maximum velocity. Therefore, choice A is the correct statement. Choice B is the definition of the Michaelis-Menten equation. Choice C is a statement about the dissociation constant, KD, for the enzyme-substrate complex, which is related to K m but not equal to it. Choice D is false because the value of K m depends on the specific substrate molecule. Choice E is false because K m does not have units of moles− 1 .

Which statement is correct about the Michaelis-Menten constant, Km, for the kinetic mechanism below? A) It is numerically equal to the substrate concentration required to achieve one half the maximum velocity. B) Its defined as Km= k1/(k−1+ k2). C) It is approximately equal to the dissociation constant for the enzyme-substrate complex to E + P. D) The value of Kmis constant for an enzyme regardless of the specific substrate molecule used to determine it. E) Its numeric value has the units of moles− 1 .

The Michaelis-Menten constant, K m , is defined as the substrate concentration at which the reaction velocity is half of the maximum velocity. Therefore, choice A is the correct statement. Choice B is the definition of the Michaelis-Menten equation. Choice C is a statement about the dissociation constant, KD, for the enzyme-substrate complex, which is related to K m but not equal to it. Choice D is false because the value of K m depends on the specific substrate molecule. Choice E is false because K m does not have units of moles− 1 .

Question 12

(Multiple Choice)

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

A) It is numerically equal to the substrate concentration required to achieve one half the maximum velocity.
B) Its defined as K_m = k₁/(k−₁ + k₂).
C) It is approximately equal to the dissociation constant for the enzyme-substrate complex to E + P.
D) The value of K_m is constant for an enzyme regardless of the specific substrate molecule used to determine it.
E) Its numeric value has the units of moles−¹.

Answer

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