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用3H.标记的尿嘧啶核糖核苷酸研究DNA的复制 利用纸层析法提取叶绿体中的色素 用标志重捕法进行鼠种群密度的调查 利用动物细胞培养技术检测有毒物质
It’s your opinion I don’t mind That’s your decision It’s all up to you
wouldn’t needn’t mustn’t oughtn’t
The parents as well as their child Not the parents but their child Neither the child nor his parents Both the parents and their child
rushed in a crowd in a crowd rushed a crowd in rushed in rushed a crowd
乳酸+碳酸氢钠→乳酸钠+碳酸 碳酸钠+碳酸→碳酸氢钠 抗毒素中和外毒素 丙酮酸+水→二氧化碳+氢+能量
肽键数目减少8个 C.原子减少12个 氨基和羧基分别增加3个 O.原子数目减少4个
At no time In no time At any time At one time
was it wasn’t it did they didn’t they
甲、乙杂交后代的性状分离之比是3∶1 甲、丙杂交后代的基因型之比是1∶1∶1∶1 四株豌豆自交都能产生基因型为AAbb的后代 甲株中基因A.与a的分开发生在减数第二次分裂时期
1种说法正确 2种说法正确 3种说法正确 4种说法正确
being there there having been there was should there be
in case provided that or else as if
右侧较高 左侧较高 右侧为高渗，即浓度较高 两侧等渗，即浓度相等
此生态系统中的生产者不止一个 辛从食物链甲→丙→乙→丁→辛获得的能量最少 若丙种群数量下降10%，辛种群不会发生明显变化 既存在竞争关系又有捕食关系的只有丁和辛
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