下列关于K的叙述，错误的是（）
A.等于反应速度为最大速度一半时的底物浓度
B.可表示酶与底物的亲和力
C.酶的特征常数
D.与酶浓度有关
E.单位为mmol/L
参考答案：D
解析：(1)K值等于反应速度为最大速度一半时的底物浓度；(2)K可表示酶与底物的亲和力。K值大，酶与底物的亲和力低；(3)K为酶的特征常数，K值与酶的浓度无关。K值的单位为mmol/L。
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