From the experiment conducted, it is possible to note that the ph effect on the enzymes activity confirms the results. Though the results in this particular experiment were not as drastic as expected, it shows the highest activity of the enzymes at the pH of 7 which is almost similar to the body pH.
In the presence of inhibitor (plus inhibitor), higher concentration of substrate is required to shift the enzyme to the active conformation. However once a high enough concentration of substrate is reached to promote active shape, the substrate binds cooperatively (S-shaped curve), and the same maximum rate is achieved as without inhibitor.