第4题: [单项选择]下列反应中不能被6-巯基嘌呤抑制的是 A. I→IMP B. AMP→ADP C. IMP→AMP D. IMP→GMP 参考答案:B 答案解析:[考点] 嘌呤、嘧啶核苷酸的抗代谢物 [分析] 6-巯基嘌呤(6MP)的结构与次黄嘌呤相似,6MP在体内经磷酸核糖化而生成 6MP核苷酸,其与IMP相似,以假乱真干扰了嘌呤核苷酸的转化,从而
第29题: [单项选择]What does the man think of the woman’s plan [A] He can help her find the name. [B] She had better get two poetry books instead. [C] She might be wasting her time. 参考答案:C 答案解析:[考点] 细节题
[解析] 男士宁愿买一本小说而不是那本诗集。故本题答案为C。