PLEASSEEE Help me with enzymes!!?

Question

How does one substrate react at the enzyme's active complex without another substrate? Does it react with the enzyme?

But I thought enxymes are defined as catalysts that AREN'T used in the reaction itself...? So there are 3 reactions that occcur before the product is finished?

HELP ME!!

cofactors, coenzymes ahhh it's all so confusing!

Thanks =)

Answer 1

look into epigenetics

Answer 2

yea the enzyme isnt used up in the reaction. Im not sure what you are asking but the 3 things that an enzyme does to a substrate are either:
1) Orient the substrates so that they have the right orientation when they interact.
2) Induce strain in the substrate that puts it in a more unstable transition state.
3) Temporarily add chemical groups to substrates that may make it more chemically reactive. For example, an enzyme can add charges to a substrate.

Answer 3

enzymes are catalysts that speed up chemical reactions. there is also enzyme inhibitors that either the substrate binds to the enzyme or makes it change the shape. normal binding is when the substrate binds normally to the enzyme. competitive inhibition is when the inhibitor mimics the substrate, competing for the active site. and the incompetitive inhibition is when the inhibitor binds to the enzyme away from the active, altering the conformation of the enzyme so that its active site no longer functions.
some substrate make the enzyme change shape in order for it to bind together. the enzyme shape could also change due to ph , temperature, and more
hope this helps!