(单选题)29: 底物浓度达到饱和后??( )
A: 反应速度随底物浓度增加而加快
B: 酶的活性中心全部被底物占据，反应速度不再加快
C: 酶随着底物浓度的增加反而逐渐失活
D: 形成酶－底物复合物随底物浓度增加而加快
E: 增加抑制剂，反应速度反而加快
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