It is not true in uncompetitive and it is not true in non competitive. So if you're given a problem and you are told that by increasing the concentration you essentially remove that effect, you should know that that is competitive inhibition. Now, what's one example of a molecule that acts as an inhibitor in the competitive inhibition fashion? Well, inside our body, the cells have to be able to synthesize purine molecules and pyrimidine molecules because these are the molecules that are basically used to produce DNA molecules. Now, one important enzyme in the biosynthesis of purines and pyramidines is known as Dihydropholate reductase. And the substrate to this enzyme is dihydrophobate.