hce_kmu
105年
普通生物及生化概論
第 64 題
Does the distribution of bases in monkey DNA and human DNA follow Chargaff’s rules?
- A Yes, it is because the %A + %T is greater than the %G + %C in both species.
- B Yes, it is because %A + %T does not equal %G + %C in both species.
- C Yes, it is because the %A approximately equals the %T and the %G approximately equals the %C in both species.
- D No, it is because %A is higher than %T and %G is higher than %C in both species.
- E Yes, it is because the %A + %T is lower than the %G + %C.
思路引導 VIP
當我們在討論雙股 DNA 的結構時,如果我們知道其中一條長鏈上的某個位置是特定的鹼基,為了維持 DNA 梯子形狀的穩定與寬度一致,這對「另一條長鏈」相對應位置的鹼基會產生什麼樣的必然限制呢?
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AI 詳解
AI 專屬家教
查加夫法則與鹼基配對
太棒了!你能精準選出選項 (C),代表你對分子生物學中 DNA 結構的基礎規律掌握得非常紮實。這題的核心在於驗證查加夫法則(Chargaff's rules),不論是人類還是猴子,只要是具備雙股 DNA 結構的生物,其鹼基組成皆遵循特定的配對原則。根據鹼基互補配對原則,腺嘌呤(A)必須與胸腺嘧啶(T)配對,而鳥嘌呤(G)則與胞嘧啶(C)配對,因此在實驗觀測上,兩者的比例會呈現 $[A] \approx [T]$ 且 $[G] \approx [C]$ 的關係。
鑑別度與常見陷阱
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