The chemical structures that form the units of DNA and RNA and that encode genetic information i.e. the bases that make up the base-pairs are A, G, T, C and U (see DNA).

形成DNA、RNA单体以及编码遗传信息的化学结构，也就是组成碱基对的碱基包括A、G、T、C、U。

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Peripheral T-lymphocyte subsets of 48 HCV-RNA seropositive and 35 HCV-RNA seronegative chronic hepatitis -C patients were investigated arid 20 normal subjects were kept as control.

对48例血清HCV-RNA阳性和35例HCV-RNA阴性的慢性丙型肝炎（慢丙肝）患者外周血T淋巴细胞亚群进行观察，并与20例正常人对照。

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In animal experiments, T-2 toxin on animals shows a clearer immunotoxic and blood toxicity, suppresses DNA, RNA and protein synthesis, induces cell to die and causes leucocyte lack and so on.

在动物实验中，T-2毒素对动物显示了比较明确的免疫毒性及血液毒性，可抑制DNA、RNA及蛋白质合成，诱导细胞凋亡，引起白细胞缺乏等。

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The one that appears only in RNA is , the one that appears only in DNA is .

仅出现在RNA中的碱基是U,仅出现在DNA中的是T

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If the messenger RNA for protein is not present in a cell, then that can't be translated, obviously, and the protein can't be made.

如果细胞中没有,用来合成蛋白质的mRNA,那就不能进行翻译,很明显,蛋白质也不能被合成

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Now remember that only appears in DNA and appears in RNA, and so can also form a hydrogen binding pair with .

还要记住T只出现在DNA中,而U出现在RNA中,U和A也可以通过氢键结合就可以了

耶鲁公开课 - 生物医学工程探索课程节选