These are molecules that bind to the active site of an enzyme, preventing the substrate from binding and thus inhibiting the enzyme's function.
Imagine you're at a concert and you have a VIP pass (you're the substrate) that allows you to meet your favorite band backstage (the enzyme). But just as you're about to enter, someone else with a fake VIP pass (competitive inhibitor) rushes in and takes your spot. You can't meet the band because this imposter took your place!
Active Site: The specific region on an enzyme where a substrate binds.
Substrate: A molecule upon which an enzyme acts.
Enzyme-Substrate Complex: The temporary complex formed when an enzyme binds to its substrate molecule(s).
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