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    一模生物典型考題精選及解析

    2019-02-19 14:13:21  來源:本站原創

    一模生物典型考題精選及解析!轉眼時間來到3月份,距離高考僅剩不到100天,同時也進入了關鍵的二輪復習階段。在二輪復習中,生物科目最顯著的變化就是從知識點的復習鞏固為主變成了以題型考點的練習提升為主。面是為大家帶來一模生物典型考題精選及解析。希望能幫到大家!

     

     

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      一模生物典型考題精選及解析


      愛智康高中學科部 鐘凱老師


      轉眼時間來到3月份,距離高考僅剩不到100天,同時也進入了關鍵的二輪復習階段。在二輪復習中,生物科目最顯著的變化就是從知識點的復習鞏固為主變成了以題型考點的練習提升為主。而理綜生物最有區分度的考點就是實驗和遺傳了,尤其是遺傳探究的解答題,更是具有壓軸效果的。下面為同學們整理了5道與實驗和遺傳相關的一模經典考題和解析,供大家進行練習提高。


      1.下列對實驗敘述正確的是( )


      A.將組織中提取的DNA絲狀物直接放入二苯胺試劑中,沸水浴后冷卻變藍


      B.大腸桿菌的培養和分離實驗時,若菌液濃度太高,培養基上菌落會相互重疊


      C.PCR技術要求反應體系中,要有一種與目的基因互補的DNA引物鏈


      D.植物組織培養時,培養基中的蔗糖用葡萄糖代替后不會影響植物的正常生長


      答案:B


      解析:


      將組織中提取的DNA絲狀物溶解于氯化鈉溶液中,與二苯胺試劑混合,沸水浴后冷卻變藍,不能直接放入二苯胺試劑中,A錯誤;


      PCR技術要求反應體系中,要有兩種引物鏈,C錯誤;


      植物組織培養時,培養基中的蔗糖用葡萄糖代替后會影響植物的正常生長,D錯誤。


      故選擇B選項。

     

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