JUPEBBiologyEnzymes

Which statement correctly describes a non-competitive inhibitor?

AIt is always a heavy metal ion.
BIt binds to the active site and can be displaced by excess substrate.
CIt binds to a site other than the active site, changing the enzyme's shape, and is not overcome by adding more substrate.CORRECT
DIt increases the affinity of the enzyme for its substrate.
AI
Toaster Teacher
Why the answer is C, and why the others tempt you.
A non-competitive inhibitor attaches to an allosteric site, distorting the active site so the substrate cannot bind properly. Because it does not compete for the active site, raising the substrate concentration does not restore full activity, which distinguishes it from competitive inhibition.
Want this in Pidgin, Yoruba, Igbo or Hausa? Sign up free →

Practice more Biology questions

JUPEB Biology has thousands more questions like this — with Worked answers on every one.

Start practicing free →See all Biology questions