Which of the Following Is True Concerning the Rate-Limiting Step

Multiple Choice

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.