------------------------------------------------------------------------------------------------------------------------------单选题难溶于水，易溶于乙醇和亲脂性有机溶剂的是（）A:<span>游离的萜类化合物</span>B:<span>与糖结合成苷的萜类化合物</span>C:<span>环烯醚萜苷类化合物</span>D:<span>皂苷类化合物</span>E:<span>单糖类化合物</span>单选题最难被酸水解的是（）A:<span>氧苷</span>B:<span>氮苷</span>C:<span>硫苷</span>D:<span>碳苷</span>E:<span>氰苷</span>单选题具有旋光性的游离黄酮类型是（）A:<span>黄酮</span>B:<span>黄酮醇</span>C:<span>异黄酮</span>D:<span>查耳酮</span>E:<span>二氢黄酮</span>单选题大黄素型蒽醌母核上的羟基分布情况是（）A:<span>一个苯环的β-位</span>B:<span>苯环的β-位</span>C:<span>在两个苯环的α或β位</span>D:<span>一个苯环的α或β位</span>E:<span>在醌环上</span>单选题从苦参总碱中分离苦参碱和氧化苦参碱是利用二者（）A:<span>在水中溶解度不同</span>B:<span>在乙醇中溶解度不同</span>C:<span>在氯仿中溶解度不同</span>D:<span>在苯中溶解度不同</span>E:<span>在乙醚中溶解度不同</span>单选题糖的纸色谱中常用的显色剂是（）A:<span>molisch试剂</span>B:<span>苯胺-邻苯二甲酸试剂</span>C:<span>Keller-Kiliani试剂</span>D:<span>醋酐-浓硫酸试剂</span>E:<span>香草醛-浓硫酸试剂</span>单选题既有黄酮，又有木脂素结构的成分是（）A:<span>槲皮素</span>B:<span>大豆素</span>C:<span>橙皮苷</span>D:<span>水飞蓟素</span>E:<span>黄芩素</span>单选题下列蒽醌有升华性的是A:<span>大黄酚葡萄糖苷</span>B:<span>大黄酚</span>------------------------------------------------------------------------------------------------------------------------------C:<span>番泻苷</span>D:<span>大黄素龙胆双糖苷</span>E:<span>芦荟苷</span>单选题挥发油中的萜类化合物主要是（）A:<span>二萜类</span>B:<span>二倍半萜类</span>C:<span>单萜和倍半萜类</span>D:<span>小分子脂肪族化合物</span>E:<span>挥发性生物碱</span>单选题下列化合物泻下作用最强的是A:<span>大黄素</span>B:<span>大黄素葡萄糖苷</span>C:<span>番泻苷</span>D:<span>大黄素龙胆双糖苷</span>E:<span>大黄酸葡萄糖苷</span>单选题天然产物中，不同的糖和苷元所形成的苷中，最难水解的苷是（）A:<span>糖醛酸苷</span>B:<span>氨基糖苷</span>C:<span>羟基糖苷</span>D:<span>2，6—二去氧糖苷</span>E:<span>6—去氧糖苷</span>单选题结构式测定一般不用下列哪种方法（）A:<span>紫外光谱</span>B:<span>红外光谱</span>C:<span>可见光谱</span>D:<span>核磁共振光谱</span>E:<span>质谱</span>单选题可以作为皂苷纸色谱显色剂的是（）A:<span>醋酐-浓硫酸试剂</span>B:<span>香草醛-浓硫酸试剂</span>C:<span>三氯化铁-冰醋酸试剂</span>D:<span>三氯醋酸试剂</span>E:<span>α-萘酚-浓硫酸试剂</span>单选题通常以树脂、苦味质、植物醇等为存在形式的萜类化合物