The correct answer is "pure noncompetitive inhibition." Noncompetitive inhibition, or mixed inhibition, is when the inhibitor binds to both the free enzyme and the enzyme-substrate complex, but may not bind equally to both. Competitive inhibitors bind to the free enzyme only at the enzyme’s substrate binding site, thus “competing” with the substrate for the binding site. Uncompetitive inhibitors do not bind the free enzyme but only to the enzyme-substrate complex.

Recall that the change in is only effected by the binding affinity to the enzyme substrate complex. We can represent the effect on the by this inhibitor by the following equation.

Since the apparent decreased by a factor of 3, we know that is 3.

Solve for in the following equation:

Above, is of the enzyme substrate complex, which is .

Solve.

The correct answer is "pure noncompetitive inhibition." Noncompetitive inhibition, or mixed inhibition, is when the inhibitor binds to both the free enzyme and the enzyme-substrate complex, but may not bind equally to both. Competitive inhibitors bind to the free enzyme only at the enzyme’s substrate binding site, thus “competing” with the substrate for the binding site. Uncompetitive inhibitors do not bind the free enzyme but only to the enzyme-substrate complex.

The molecule in the question is classified as an enzyme inhibitor because it inhibits an enzymatic reaction. There are two types of inhibitors; competitive and noncompetitive inhibitors. Competitive inhibitors bind to the active site of the enzyme and prevent substrate from binding. They can be, however, dissociated with the addition of more substrates. This occurs because the substrates can dissociate the reversible bonds between inhibitor and enzyme and bind to active sites. Competitive inhibitors increase (or decrease the affinity of enzyme and substrate) but leave the unaltered. According to the information given in the question, we can conclude that the molecule is a competitive inhibitor.

Noncompetitive inhibitors bind irreversibly to an allosteric site of the enzyme and prevent substrate from binding to the active site. These types of inhibitors decrease the maximum reaction rate but leave the unaltered.

Competitive inhibition involves the substrate's access to the active site. In the case of competitive inhibition, the inhibitor blocks the substrate from the active site. As a result, the is unchanged, but the is increased. Recall that is the substrate concentration at which the reaction rate is . Additionally, the reaction rate will increase with increased concentration of competitive inhibitor and substrate, because they are competing for the active site, causing an increase in reaction rate.

All types of inhibitors will induce a change in the of an enzyme except for competitive inhibitors. This is because competitive inhibitors have no effect on the enzyme-subtrate complex. The may still be reached, but by adding more substrate, since the is increased by a competitive inhibitor.

A competitive inhibitor acts the increase the of a reaction, but does not alter the . This does not describe the inhibition on Enzyme A or Enzyme B. A noncompetitive inhibitor decreases the , but does not change the . This is the inhibition that is described on Enzyme A. An uncompetitive inhibitor decreases both the and the . This is the inhibition that is described on Enzyme B.

All types of inhibitors will induce a change in the of an enzyme except for competitive inhibitors. This is because competitive inhibitors have no effect on the enzyme-subtrate complex. The may still be reached, but by adding more substrate, since the is increased by a competitive inhibitor.

Competitive inhibitors bind to the active site of the enzyme and prevent substrates from binding to enzyme. This prevents the enzyme-substrate reaction from happening, thereby decreasing the activity of enzymes; however, competitive inhibitors can be overcome by increasing the concentration of substrates. Increase in the amount of substrates will displace the inhibitors from the active site and allow for substrates to bind. This will bring the efficacy of the enzyme back up to normal levels.

Increasing and decreasing the volume of the solution will concentrate or dilute all species in the solution, respectively. This will not decrease the effects of competitive inhibitors on the enzyme.

Because carbon monoxide binds at the same site as oxygen, this is a form of competitive inhibition. In order to overcome this type of inhibition, the concentration of substrate (oxygen) needs to be increased.