From a beginning to another beginning: mammalian early embryonic development……………………………………………………………………………………………………Liu Shichao Qu Yongcun Zhang Ying（1）

Phage display techniques:comment on 2018 Nobel Prize in Chemistry……………………………………………………………Ge Yimeng Zhang Yuying Lin Yiting Yao Yifan Wang Xueheng Wang Yuedan（5）

Negative side and positive side of the Prion proteins（9 ）………………………………………Zhu Qinshi（9）

Specific recognition and selective cleavage of introns…………………………Chen Lingli Hu Xuefeng（12）

The enlightenment of "Scientific knowledge is tentative" in NOS to science teaching ……………………………………………………………………………………………………………Guo Shuchen Liu Enshan（16）

Correlation analysis between converting abilities of multiple representations about sex-related inheritance and approaches of biological learning in high school students…………………Li Yiyun Li Xuefeng（19）

The teaching design of the course "Eyes: the visual organ to feel the outside light"…………………………………………………………………………………………………Zhao Guangyu Xu Jie Wang Shaoxin（23）

A preliminary study on the development and practice of "Wonderful plants" in the school-based curriculum of Biology……………………………………………………………………………Tang Feng（26）

Argument and analysis based on the issues which appear in the scientific experiments……………………………………………………………………………………………………………Zhang Xu Lin Yuchen（29）

The monitoring of licking salt behavior in takin and sambar in Wolong nature reserve …………………………Liu Mingchong Zou Xiaoyan Lin Yuting Tang Zhuo Ma Lianping Zhang Juyi Wang Pengyan（32）

Improvement on the experiment of observing DNA and RNA distribution in cells………………………………………………………………………………………………………………Yang Zhongshun Lin Yifan（36）

Practice of scientific exploration in high school biology teaching based on STEM concept：Effects of low temperature and pH on the chlorophyll a and photosynthetic activity of Microcystis …………………………………………………………………………………………………………Zhang Xidong Duan Zhipeng（39）

Examing the content of major organic matter in wheat during different developmental stages…………………………………………………………………………………Bai Jingwei Zhang Yongxin Zhao Jingqiu（42）

Study on the effect of light intensity on the cyclosis rate of hydrilla……………………………………………………………………………………………………Sun Juan Xiu Guodong Li Lujun Wang Xianfei（48）

"PCR" items in biology test （Bei Jing） of college entrance examination ……………Xu Jie Sun Peng（45）

The standard features and implications of Singapore A-level biology H2 curriculum………………………………………………………………………………………………………………………Xue Ling Chen Xin（55）