酶一活细胞产生的，能在细胞内外起作用 的（催化）生理活性物质。 enzyme-organic chemical substance (a catalyst)formed in living cells,able to cause changes in other substance without being changed itself. 酶的化学本质？酶——活细胞产生的，能在细胞内外起作用 的（催化）生理活性物质。 enzyme—organic chemical substance (a catalyst) formed in living cells, able to cause changes in other substance without being changed itself. 酶的化学本质？