______________________________________________________________________________________________________正确答案：磷酸甘油酸激酶phosphaglycerateki
asePGK、磷酸甘油酸变位酶、烯醇化酶、丙酮酸激酶
17写出酶活力单位中IU和Katal单位的含义。（分数：800）_______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________正确答案：IU：酶活性酶活性的大小在特定的条件下，1mi
能转化1μmol底物的酶量，即1IU1μmolmi
。催量katal简称Kat：它的定义是在最适条件下每s催化1mol底物转化的酶量。Kat对血清酶活性测定而言显得过大，故用μkatal或
katal_______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
三、分析论述题总题数：2，分数：260019当哺乳动物缺乏硫胺素和生物素时，软脂肪从头合成率下降，请解释原因。（分数：1300）_______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
3
f正确答案：哺乳动物脂肪酸的合成是在脂肪酸合成酶复合体的作用下完成的。Ecoli的脂肪酸合成酶复合体包含7种酶，而哺乳动物的脂肪酸合成酶只有一条肽链，但具有多种催化活性。另外，脂肪酸的合成还需要酰基载体蛋白ACP：acylcarrierprotei
来转移酰基基团。Ecoli中脂肪酸合成包括5r