RNA polymerase also then binds the RNA nucleotides together making a new RNA strand.

然后 RNA 聚合酶也将 RNA 核苷酸结合在一起，形成新的 RNA 链。

In the nucleus, the enzyme RNA polymerase unwinds and unzips the two strands of DNA that contain the protein-making gene.

在细胞核中，RNA 聚合酶解开包含蛋白质制造基因的两条 DNA 链。

With RNA viruses, many of them stay in the cytoplasm where the viral RNA is used by the host's ribosomes to create viral RNA polymerase proteins.

对于RNA病毒，它们中的许多都待在细胞质中，病毒RNA在这里由宿主的核糖体合成病毒RNA聚合酶。

Now this virus is a single-stranded RNA virus, and it's also a negative sense, meaning it first has to be transcribed by RNA polymerase into a positive-sense mRNA strand.

麻疹病毒是一种单链RNA病毒，也就是负义链的病毒，这意味着它首先必须被RNA聚合酶转录成正义mRNA链（正义链与反义链互补）。

RNA polymerases are more likely to make copying errors than DNA polymerases and therefore often make mistakes during transcription, this is why mutations in RNA viruses occur more frequently than in DNA viruses.

RNA聚合酶在复制时比DNA聚合酶更容易产生错误，因此在转录过程中经常出错，也就是为什么RNA病毒的突变比DNA病毒发生得更频繁。