
生物工程_提取DNA實驗
Authored by R Yung
Biology
6th - 8th Grade
Used 1+ times

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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
在實驗中加入清潔劑的功用是
破壞細胞壁和細胞膜。
破壞細胞膜和核膜。
破壞核膜和蛋白質。
破壞細胞壁和蛋白質。
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
為什麼在實驗中需要加入鹽 (氯化鈉)?
中和 DNA 的負電荷
中和 DNA 的正電荷
降低植物細胞水勢,使其質壁分離
降低溶液水勢,使物質更容易進入細胞內
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
為什麼在實驗中需要加入酒精?
分解蛋白質
將 DNA 分解成細小的碎片
去除士多啤梨的色素
使 DNA 沉澱
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
怎樣得知提取的白色物質含有 DNA?
以光學顯微鏡觀察,並觀察到 DNA 的雙螺旋結構
進行凝膠電泳,
並觀察到 DNA 指紋移動
加入通用指示劑,
溶液會呈橙色
白色物質能吸引
正電荷的物質
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
挑戰題︰ DNA 的體積十分細小。為什麼此實驗的提取物是肉眼可以觀察的?
因為提取物並非只有DNA,亦含有雜質
因為 DNA 是白色的
因為提取的 DNA 量十分多
因為 DNA 接觸酒精後會變為白色
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