They were probably simpler than any cell now alive, and may have lacked not only protein-based catalysis, but perhaps even the familiar genetic macromolecules, with their ribose-phosphate backbones.
他们可能比现在任何一种活着的细胞都简单，也许既缺乏蛋白质催化酶，也没有我们熟悉的具磷酸核糖股价的遗传大分子。
The ribose of one nucleotide joins with the phosphate of the next to form the RNA backbone.
一个核的核糖和下一个磷酸盐相连，形成核糖核酸的支柱。
ADP (adensine diphosphate) A nucleotide consisting of adenine and ribose with two phosphate groups attached. The second phosphate is attached to the first by a high-energy bond.
腺（嘌呤核）苷二磷酸：一种由腺嘌呤和核糖再加上两个磷酸组成的核苷酸。其中第二个磷酸以高能键与第一个磷酸结合。
ADP (adensine diphosphate) A nucleotide consisting of adenine and ribose with two phosphate groups attached. The second phosphate is attached to the first by a high-energy bond.
腺（嘌呤核）苷二磷酸：一种由腺嘌呤和核糖再加上两个磷酸组成的核苷酸。其中第二个磷酸以高能键与第一个磷酸结合。
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