The statement that is true about non competitive inhibitors is that it is an example of allosteric regulation.
When we talk about inhibition, we are talking about a situation in which there is a substance that occupies the position that an enzyme is suposed to bind. It could be a case of competitive or non competitive inhibition.
When we talk about a competitive inhibition, it means that the inhibitor looks somewhat like the enzyme thus it can occupy its place. On the other hand when we have a non competitive inhibitor, the inhibitor does not look like the enzyme.
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