what is active site.....

Active site :

As the substrate molecule are comparatively much smaller than the enzyme molecule there should be the some specific reason are site on enzyme for binding with the substrate such a site are called as active side side side or catalytic site.

 Features: 

1.  Active site occupies relatively small portion of the enzyme

2.  An active site posses  substrate binding site  and catalytic site

3.  the co-enzymes and co-factor on which some enzymes depend    present as part of the catalytic site

4. Substrate binds  at active site with weak non covalent bond or with relative weak  forces