DNA在水溶解中热变性之后,如果将溶液迅速冷却,则DNA保持______状态;若使溶液缓慢冷却,则DNA重新形成______。
参考答案:单链;双链
We want to know______ popcorn. Can you give us some help?
A. how to make B. what to make C. how making
药物的靶向从到达的部位可以分为三级。