Which of the following is true concerning the rate-limiting step in a metabolic pathway?
A. It is likely to be the slowest reaction in the pathway, and it is always the last step in a metabolic pathway.
B. It is likely to be the fastest reaction in the pathway, and it is always the last step in a metabolic pathway.
C. It is always the first step in the pathway, and may be subject to end-product inhibition.
D. It is likely to be the slowest reaction in the pathway and it may be subject to end-product inhibition.
E. It is likely to be the fastest reaction in the pathway and it may be subject to end-product inhibition.
D
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