Answer:
A non-competitive inhibitor
Step-by-step explanation:
An enzyme inhibitor is a substance that prevents an enzyme from catalysing a reaction by binding on the enzyme. There are two types of inhibitors: competitive and non-competitive.
Competitive inhibitors are substances whose shapes are similar to those of the substrate thus they compete with the substarte for the active sites. Non-competitive inhibitors are substances that attach themselves onto the enzyme molecule altering the shape of active sites. This way, the substrate molecules are not able to bind onto the active sites. The non-inhibitor molecules do not compete for active sites.