【简答题】阅读理解。( 10 分) (A) It’s Sunday today. Jim doesn’t go to school. He stays at home. He loves his father and mother very much. They are not at home now. He wants to do some housework for them. Look! He is ...
【判断题】Since an A-T base pair is held together by fewer hydrogen bonds than is a G-C base pair. DNA rich in A-T base pairs is relatively easy to pull apart, and A-T-rich stretches of DNA are typically found ...