
DNA與遺傳學測驗
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Biology
12th Grade
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
不同的DNA核苷酸之間,存在差異的部分是
鹼基。
核糖。
去氧核糖。
磷酸鹽團基。
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
某真核細胞的DNA含有20%腺嘌呤 (A) 鹼基。這個DNA的胞嘧啶 (C) 鹼基含量百分率是多少?
60%
40%
30%
20%
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
下圖展示一個DNA模型:以下哪個組合最有可能分辨出W、X、Y和Z各分子?
糖(W)
磷酸鹽(X)
胞嘧啶(Y)
胸腺嘧啶(Z)
糖(W)
磷酸鹽(X)
胞嘧啶(Y)
鳥嘧啶(Z)
磷酸鹽(W)
糖(X)
腺嘌呤(Y)
胸腺嘧啶(Z)
磷酸鹽(W)
糖(X)
腺嘌呤(Y)
鳥嘧啶(Z)
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
在進行有絲分裂的一刻,細胞P的DNA含量為x;分裂後的每個子細胞有4條染色體。以下哪項描述是正確的?
子細胞的DNA含量是0.5x
每條染色體的DNA含量為0.25x
細胞P的雙倍體狀態含有8條染色體
細胞P在分裂前的一刻有8條染色體
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
指示:參考以下果蠅的兩個交配,解答10和11兩題。雄性的果蠅是異配性別(XY),翅膀的形狀(正常翅膀或削短翅膀)則由某基因單獨控制。
以下哪項由交配 I 所得的觀察,最能支持正常翅膀是顯性表現型的結論?
所有F1個體均具正常翅膀。
F2中具正常翅膀的個體與具削短翅膀的個體比例是3:1。
F2中具正常翅膀的個體較具削短翅膀的個體為多。
F2中具正常翅膀的雄性個體與具削短翅膀的雄性個體數目大致相同。
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