【单选题】酶与底物的关系是
A.
如果酶的浓度不变,则底物浓度改变不影响反应速度
B.
当底物浓度很高使酶被饱和时,改变酶的浓度将不再改变反应速度
D.
在反应过程中,随着产物生成的增加,反应的平衡常数将左移
E.
当底物浓度增高将酶饱和时,反应速度不再随底物浓度的增加而改变
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【多选题】共同存在于 RNA 和 DNA 中的碱基是( )
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