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原文連結
論文資訊
- 類型：已發表論文
- 日期：2014-06-27
摘要
Because RNA can be a carrier of 遺傳 資訊 and a biocatalyst, there is a consensus that it emerged before DNA and 蛋白質s, which eventually assumed these roles and relegated RNA to intermediate functions. If such a scenario-the so-called RNA world-existed, we might hope to find its relics in our present world. The properties of viroids that make them candidates for being survivors of the RNA world include those expected for primitive RNA replicons: (a) small size imposed by error-prone replication, (b) high G + C content to increase replication fidelity, (c) circular structure for assuring complete replication without genomic tags, (d) structural periodicity for modular assembly into enlarged 基因組s, (e) lack of 蛋白質-coding ability consistent with a ribosome-free habitat, and (f) replication mediated
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