任務Task
Design and make a DNA model for demonstration in the coming school open day.
背景知識Background knowledge about DNA double helix
- DNA雙螺旋結構的闊度為2.0 nm，而相鄰的鹼基對的距離為0.34 nm。（圖1）
- nm 是納米的符號，1 nm = 0.000 000 001 m。
- 一圈完整的雙螺旋旋轉大約包含10對鹼基對。（圖1）
- 一般來說，DNA都是右手螺旋的。（圖2）
- The width of the DNA double helix is 2.0 nm, while the distance between adjacent base pairs is 0.34 nm. (Fig. 1)
- nm is short for nanometre, which is equal to 0.000 000 001 m.
- One complete turn of the double helix contains about 10 base pairs. (Fig. 1)
- In general, DNA is a right-handed helix. (Fig. 2)
老師會把全班分成數組。試和你的組員合作設計和製作DNA模型。Your teacher will divide the class into groups. Collaborate with your group members to design and make the DNA model.
第一部分—設計DNA模型Part A—Design a DNA model
1.
在互聯網搜尋製作DNA模型的不同方法。列出你的設計所需的物料。
2.
在以下的空位內繪畫你的設計，並在各部分加上標註。試簡單描述製作DNA模型的步驟。
1.
Search the Internet for different methods of making a DNA model. List the materials your group will choose to make the DNA model.
2.
Draw your design below. Label all the parts. Also, briefly describe how you will make the model.
3.
Write the source(s) of reference that your model is based on.
得到老師的許可後，你現在可以和組員收集所需物料和製作模型。After getting your teacher’s approval, you can collect your own materials and make the DNA model.
第二部分—製作模型和傳達結果Part B—Make the model and communicate results
- 和組員在堂上合作完成DNA模型。
- 在班上展示和介紹你組的DNA模型。
- Collaborate with your group members to make the model in lessons.
- Present and display your model to the class.
第三部分—評價和改良Part C—Evaluate and redesign
2.
你認為哪一組的設計是最好的？寫出他們的設計的兩個優點。
1.
Ask your teacher to evaluate your DNA model using the following Grading Rubric:
2.
Which group’s design do you think is the best? Write TWO advantages of their design.
3.
What modifications can you make to your DNA model?
第四部分—想一想Part D—Think about
3.
直到1950年代，DNA的雙螺旋結構才被發現。這發現有甚麼重要性？
1.
In which part of the cell is DNA found?
2.
Briefly describe the double helix structure of DNA.
3.
The double helix structure of DNA was only discovered until the 1950s. What is the importance of the discovery of the structure of DNA?
4.
Submit Student’s Worksheets to your teacher after the lesson.
第五部分—附加資源Part E—Further resources
如果學校有3D打印機，你可以在我們的網站下載可供3D打印的模型。如果你會使用3D製圖軟件（例如Blender），更可以設計和製作自己的3D打印模型。
If 3D printers are available at school, you can download DNA models for 3D printing from our website. If you are familiar with 3D graphic tools (e.g. Blender), you can also design your own 3D-printed DNA model.