enzyme molecules

[gabriella]

haya can anyone tell me the structure of enzyme and their role

please!!!!! [/b]

[Dr_Genius_EGY]

Enzymes are proteinic in structure and have catalytic functions

[Poison]

yes, thats right. Enzymes are proteins in structure. They are organic catalysts. Catalysts make the reactions faster, and are not wasted during the reaction.

[Jelanen]

Enzymes can be either protein (usually) or RNA. Enzymes reduce the energy cost of a reaction. While this may seem to "speed up" the reaction, that is actually a side effect of their true work in reducing the energy needed to drive the reaction in the direction you want it to go. Enzymes are organic catalysts in that they are not altered or destroyed in the process of reducing the required energy.

-Jelanen

[MrMistery]

true, Jelanen, enzymes can be both proteic or RNA. The most common ones are proteins so in many bio books(like mine ) RNA enzymes aren't even mentioned. They are part of a cathegory we call biocatalysts along with hormons and vitamins. From what I know, enzymes function by reducing the activation energy of a reaction, and what everyone else said seems to confirm that. Almost every chemicall reaction inside the body has an enzyme "helping it out"
Regards,
Andrew

[thank.darwin]

haya can anyone tell me the structure of enzyme and their role [/b]

Enzymes may also be inhibited by non competitive inhibitors and competitive inhibitors... non competitive inhibitors don't block the active site of an enzyme... competitive inhibitors block the active site from others. There is also feed back inhibition... do you want to know more... I can type more here...?