某DNA分子片段中,胞嘧啶有240个,占全部碱基的30%,问在这片段中

某DNA分子片段中,胞嘧啶有240个,占全部碱基的30%,问在这片段中,腺嘌呤有   (  )

A.240个      B.48个       C.800个       D.160个

答案

D


解析:

腺嘌呤占20%,通过计算可求得有180个

相关题目

如图,在△ABC中,∠ACB=90°,AC=4,∠B=30°,F为AB的中点,AE平
如图,在△ABC中,∠ACB=90°,AC=4,∠B=30°,F为AB的中点,AE平分∠BAC,点P为线段AE上一动点,当△BFP周长最小为4+4时,S△ABC=__________.
全球风带的叙述,正确的是  (      )           
全球风带的叙述,正确的是  (      )                                                             A.北半球西风
6个大小相同的正方形方块堆砌成一个长、宽、高分别为6dm,4
6个大小相同的正方形方块堆砌成一个长、宽、高分别为6dm,4dm,2dm的长方体,求组成这个长方体的每个小正方体的棱长.
已知向量,, (1)若⊥, 且-<<. 求; (2)求函数|+|
已知向量,, (1)若⊥, 且-<<. 求; (2)求函数|+|的单调增区间和函数图像的对称轴方程.
(江苏卷26). The experiment has_________ the possibility of the existence
(江苏卷26). The experiment has_________ the possibility of the existence of any life on that planet, but it does not mean there is no life on other planets. A. found out        B. pointe
下列对古代希腊罗马政治制度的评述,正确的是(     ) ①
下列对古代希腊罗马政治制度的评述,正确的是(     ) ①古希腊的民主政治中已初步体现出主权在民、集体统治和任期制等民主特征 ②古希腊的民主
阅读下面短文,根据短文内容完成表格中所缺信息,每空一
阅读下面短文,根据短文内容完成表格中所缺信息,每空一词。 Everyone has his or her dream school life.My dream school life is perfect(完美的)and colourful. First o
    Once upon a time, there was a tortoise(乌龟) on a ship. Unluckily, the
    Once upon a time, there was a tortoise(乌龟) on a ship. Unluckily, the ship went down one day. Some time later the tortoise successfully swam to a land. There was nothing to eat on the land

最新题目