【简答题】阅读表达(共5小题) I have a happy family. (4) Look! Here is a photo of my family . The boy on the bed is me. I am an English boy. My name is Peter. I am eleven years old. This is my sister. Her name is Kate. ...
【简答题】脱氧核糖核苷酸是如何构成 DNA 一级结构的? DNA 的一级结构与 RNA 的一级结构有哪些不同? 2. DNA 一级结构是如何形成 DNA 二级结构的? 3. 为什么 DNA 被称为双螺旋 DNA ?生物体内有没有三螺旋 DNA 的存在呢? 4. 科学家是如何得出 B- 双螺旋 DNA 结构特点的? 5. 为什么是 B-DNA 的结构特点,而非 A-DNA 呢?
【简答题】I am Sergey Brin! I was born in Moscow. In 1979,when I was 5, my family immigrated to California, USA . I remember that on my 9 th birthday, I got my first computer “Commodore ”. Later I graduated w...