2-生命的起源與多樣性(文件)
【正文】 ing the pioneering work of Miller and Urey, have successfully produced organic monomers including amino acids, simple sugars, and nucleic acid bases. The probable next step toward life was the spontaneous linking of such monomers into polymers such as proteinoids and nuclei acids. Current research suggests that likely sites for this polymerization were clay or rock surfaces.生命出現(xiàn)之前時期的化學構(gòu)成的證據(jù)來自模仿早期地球的物理環(huán)境和化學資源的實驗。Researchers have found that, when energy is available to a system, they can generate three kinds of organic molecular aggregates. The Russian Aleksandr Oparin obtained polymerrich droplets, called coacervates from solutions of polymers. Sidney Fox generated proteinoid microspheres from mixtures of amino acids and water. A third laboratory structure is the liposome, a spherical lipid bilayer that forms from phospholipids. A structure similar to one or more of these aggregates may have been the precursor of true cells.研究人員已經(jīng)發(fā)現(xiàn)，當一個系統(tǒng)獲得能量時，可以產(chǎn)生3種有機的分子集合體。第3個從實驗室獲得的結(jié)構(gòu)是脂質(zhì)體，由磷脂形成的球狀的脂雙層。某些催化RNAs具有催化RNA片段進行類似有性交換的功能。 the sequestering of RNA or DNA into celllike structures。 Further steps in the appearance of cells on the earth included the development of RNA and DNA as biological information molecules. Evidence suggests that RNA, which c
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