下列哪种酶在糖酵解和糖异生两条途径中都起作用（） ["己糖激酶","丙酮酸激酶","果糖双磷酸酶－1","3－磷酸甘油醛脱氢酶","丙酮酸羧化酶"] 铅中毒可引起（） ["ALA增加","血红素增加","胆色素原增加","尿卟啉增加","琥珀酰CoA减少"] 合成DNA的原料是（） ["dADPdTDPdCDPdGTP","dAMPdTMPdCMPdGMP","AMPCMPUMPGMP","dATPdTTPdCTPdGTP","ATPCTPTTPGTP"] 真核生物mRNA的转录后加工有（） ["焦磷酸化","磷酸化","去除外显子","首、尾修饰和剪接","把内含子连接起来"] 生物体编码20种氨基酸的密码个数为（） ["16","61","64","20","60"] 下列关于LPL的叙述错误的是（）