这个词是什么意思？
A polynucleotide consisting essentially of chains with a repeating backbone of phosphate and ribose units to which nitrogenous bases are attached. RNA is unique among biological macromolecules in that it can encode genetic information, serve as an abundant structural component of cells, and also possesses catalytic activity. (Rieger et al., Glossary of Genetics: Classical and Molecular, 5th ed)
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D012313 · MeSH 2026。
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