If a reaction which is stopped by substance X can recover when a lot more of the native activator is supplied, substance X would be considered which of the following?
A) covalent modulator
B) competitive inhibitor
C) allosteric modulator
D) irreversible antagonist
E) a phosphotase

Question

Quizplus · Accepted Answer

Substance X is inhibiting the reaction, but the fact that a lot more of the native activator can recover the reaction implies that it is a competitive inhibitor. A covalent modulator would irreversibly modify the enzyme to alter its activity, an allosteric modulator would bind to a different site on the enzyme to alter its shape, an irreversible antagonist would bind to the enzyme irreversibly to completely block it, and a phosphotase would remove a phosphate group from a protein to alter its activity. None of these fit the scenario described in the question as well as a competitive inhibitor.

If a Reaction Which Is Stopped by Substance X Can