Please print out this problem set and record your answers on the printed copy. Answers to this problem set are to be turned in at the box by 4: 10 Wednesday, September10. Problem sets will not be accepted late. Solutions will be posted on the web

Many intracellular proteins are required to interact or bind to other macromolecules within a bind DNA. Such proteins often have conserved structural features, called motifs, whis at can cell in order to function properly. One class of such proteins is comprised of proteins tha interact with DNA. One such motif consists of two closely aligned a-helices(shown as cylinders below)that each have leucine-rich regions. This motif is referred to as a leucine

Please print out this problem set and record your answers on the printed copy. Answers to this problem set are to be turned in at the box outside by 4: 10 Wednesday, october22 Problem sets will not be accepted late Solutions will be posted on the web

第一节细胞的结构和功能 第二节染色质和染色体 第三节细胞分裂 第四节配子的发生、受精和生活周期

9.1DNA作为主要遗传物质的证据 9.2DNA的结构、复制及其损伤修复 9.3基因的概念与发展 9.4遗传信息的表达与调控 9.5核酸研究技术简介 9.6人类基因组计划简介 9.7遗传工程及其应用

第一节细菌和病毒遗传研究的意义 第二节噬菌体的基因重组 第三节细菌基因重组

人体生命活动中所消耗的能量主要 来自生物氧化过程,因而氧是正常生命 活动不可缺少的物质。成人在静息状态 下每分种耗氧约250ml,若活动时,耗 氧明显增加。正常机体内氧的储备量 大约为1.5L左右

相貌离不开皮肤,尤其颜面部的皮肤 与美容的极其密切。皮肤的颜色主要取 决于表皮黑色素的含量。但表皮的厚薄 ,胡萝卜素等含量的多少,真皮血管的 血液供应也影响皮肤的颜色。 从生物学角度看,头发及毛发,甚至 指甲都可视为皮肤的延伸

八、物理学危机与物理学革命 九、原子内部世界的探索 十、20世纪的化学及其发展 十一、现代生物科学成就 十二、环境科学的兴起 十三、系统科学思想与方法

1.正确识别各种类型茎 2.正确识别各种类型变态茎 3.区别攀援茎与缠绕茎、匍匐茎和平卧茎 4.茎在外形上与根的区别 5.解释概念:树皮周皮