肝中富含的LDH同工酶是
A．LDH1
B．LDH2
C．LDH3
D．LDH4
E．LDH5
参考答案：E
解析： LDH有5种同工酶，LDH1(H4)、LDH2(H3M1)、LDH3(H2M2)、LDH4(H1M4)、LDH5(M4)等，由于分子结构的差异，这5种同工酶具有不同的电泳速度、对同一底物具有不同的Km值。由于不同组织器官合成这两种亚基的速度不同和两种亚基之间杂交的情况不同，故LDH的同工酶在不同组织器官中的含量与分布比例不同，如心肌中富含LDH1而肝中富含LDH5。
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