先前提要:DNA與RNA的差異
究竟 A. T. U.三個鹼基之間的關係到底是情感上的糾葛還命運的安排呢? 讓我們繼續看下去
其實DNA有T RNA有U的說法有好幾種,例如也有以能量的觀點說明U比T還較不穩定等等,我就以較多人認同的兩個觀點來說,另外先後出現的順序還有一個有趣的證據,在澳洲著名的「墨奇森隕石」(Murchisonmeteorite)上發現「尿嘧啶」(uracil)和「黃嘌呤」(xanthine)懷疑生命的起源來自於外星。
出處:Martins, Z. et al., Extraterrestrial nucleobases in the Murchison meteorite, Earth and Planetary Science Letters 270:130–136. 15 June 2008
想看更多科普漫畫歡迎訂閱阿賊的粉絲團
註:
- dTMP: Deoxythymidine monophosphate
- dUMP: Deoxyuridine monophosphate
資料來源:
- Molecular Biology. Weaver 5th edition. Chapter 20.3 P660-661
- Principles of Biochemistry. Lehninger 5th edition. Chapter 8.3 P289-290 Chapter 22.4 890-892
- Molecular Biology of the Cell. Albert 4th edition. Chapter 5
- The 100 Most Important Chemical Compounds Richard edition P92-94
- Jonsson J., Sandberg M., et al. (1996).” The evolutionary transition from uracil to thymine balances the genetic code” Journal of Chemometrics 2(10):163-170
- Lesk A.M., (1969).” Why does DNA contain thymine and RNA uracil?” J Theor Biol 22(3):537-40.
- 郭朝禎.(2009) “核酸帝國–RNA與DNA的世界” 439:52-59
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