Biochemistry
Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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The Michaelis‑Menten equation models the hyperbolic relationship between [S] and the initial reaction rate ?0V0 for an enzyme‑catalyzed, single‑substrate reaction E+S↽−−⇀ES⟶E+PE+S↽−−⇀ES⟶E+P. The model can be more readily understood when comparing three conditions: [S]<<?m[S]<<Km, [S]=?m[S]=Km, and [S]>>?m[S]>>Km.

Match each statement with the condition that it describes.

Note that "rate" refers to initial velocity ?0V0 where steady state conditions are assumed. [Etotal][Etotal] refers to the total enzyme concentration and [Efree][Efree] refers to the concentration of free enzyme.

[S] << Km
[S] = Km
[S] >> Km
Not true for any of these
conditions
Almost all active sites are empty.
[ES] is much higher than [Efree].
[Efree] is equal to [ES].
Reaction rate is independent of
[S.
[Efree] is about equal to [Etotal].
Increasing [Etotal] will lower Km-
Answer Bank
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Transcribed Image Text:[S] << Km [S] = Km [S] >> Km Not true for any of these conditions Almost all active sites are empty. [ES] is much higher than [Efree]. [Efree] is equal to [ES]. Reaction rate is independent of [S. [Efree] is about equal to [Etotal]. Increasing [Etotal] will lower Km- Answer Bank Incorrect
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