In an experiment, a small amount of allosteric inhibitor is added to tube A and no inhibitor is added to tube B.The full reaction is completed in tube B twice as quickly as it is completed in tube A.The allosteric inhibitor acted by

Question

Quizplus · Accepted Answer

The fact that the reaction was completed twice as quickly in tube B (no inhibitor added) compared to tube A (with allosteric inhibitor added) suggests that the inhibitor decreased the amount of the active form of the enzyme. If there were fewer enzyme molecules in tube A, the reaction would be slowed down in both tubes, rather than just in tube A. Increasing the amount of substrate would actually speed up the reaction, so option E is also incorrect. Option B is unlikely because allosteric inhibitors generally decrease the activity of enzymes, rather than increasing them. Similarly, option C is unlikely because the inactive form of the enzyme would not be directly involved in the rate of the reaction.

In an Experiment, a Small Amount of Allosteric Inhibitor Is