M16998The action of methotrexate on dihydrofolate reductase is an example of
A) a positive effector.
B) a negative effector.
C) a noncompetitive inhibitor.
D) a competitive inhibitor.
E) an irreversible inhibitor.
Correct Answer:
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Q25: Derivatives of tetrahydrofolic acid participate in the
Q26: A common intermediate in the biosynthesis of
Q27: Which of the following compounds is parent,
Q28: M3069Which one of the following compounds is
Q29: Xanthine oxidase contains
A) copper.
B) zinc.
C) selenium.
D) molybdenum.
E)
Q31: In purine biosynthesis, which steps require the
Q32: The product of the action of guanase
Q33: Each of the following nucleic acid bases
Q34: An enzyme which is inhibited by allopurinol
Q35: Which enzyme catalyzes the following reaction: allopurinol
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