Question

where does a substrate specifically bind on an enzyme? allosteric site binding site catalytic site active site

Explanation:

The active site is a region on the enzyme where the substrate binds. It has a specific shape that complements the substrate. The allosteric site is for binding of molecules that regulate enzyme activity. The catalytic site is part of the active site where the chemical reaction occurs. The binding site is a general term, but in enzyme - substrate context, the specific term is the active site.

Answer:

Active site