學士後西醫-生物學題庫下載題庫

上一題
75. Which of the following statements about bacterial gene regulation is FALSE?
(A) Tryptophan binds to activate repressor of trp operon.
(B) Allolactose is an inducer of lac operon.
(C) The product of lac I is the repressor of lac operon.
(D) Inactive repressor turns the repressible operon off.
(E) Catabolite activator protein (CAP) is activated by cAMP in lac operon.


答案:登入後觀看
難度: 簡單
2F
【站僕】摩檸Morning 國三下 (2015/09/30)
原本答案為A,修改為D
3F
joan Chu 小一上 (2020/06/21)

A 也不對,Trypptophan 為corepressor , 結合不具功能的aporepressor 才活化repressor 的壓制功能。


4F
Miwa 大二上 (2024/03/23)

在可抑制性色胺酸操縱組中,inactive repressor使得轉錄可以進行。反之,色胺酸若與repressor結合則轉為active,轉錄終止。

 

 
在可誘導性乳糖操縱組中,active repressor使轉錄終止。反之,異乳糖與repressor結合則轉為inactive,轉錄可表現。

所以結論:inactive repressor 是可表現

A的話,如果解釋成:結合在operon上的是[色胺酸與活化態的repressor],則正確

75. Which of the following statements ab..-阿摩線上測驗