答錯有掌生物遊戲~!!

fish

原帖由 dolphin_ice 於 17/11/2007 10:43 PM 發表
紫外線能量高, 會excite 電子
excited電子會使DNA中的thymine和另一個thymine相配 (原本應和Adenine相配)
這樣, DNA的資料就會錯
製造出來的蛋白質也自然會錯

I don't agree with you fully as I think you wrongly interpret the word "pyrimidine dimer".

A pyrimidine dimer is formed by the formation of covalent bonds between adjacent pyrimidines (i.e. T-T, C-C or T-C).  UV radiation is one of the mutagens that leads to dimer formation. The formation of dimer leads to structural change (bending) in the backbone of a DNA molecule and during replication, the dimer will prevent base pairing and lead to premature termination of transcription.

dolphin_ice

原帖由 fish 於 18/11/2007 12:51 AM 發表

                               
登錄/註冊後可看大圖

I don't agree with you fully as I think you wrongly interpret the word "pyrimidine dimer".

A pyrimidine dimer is formed by the formation of covalent bonds between adjacent pyrimidines (i.e. T-T ...

I refine what I have said, as you should be correct.

Royal

究竟幾時開估??

dolphin_ice

都差唔多知晒D ans ga la...