Unlike their bacterial ancestors, the cells had specialised structures including a nucleus, as well as machinery vital for photosynthesis.

和他们的细菌祖先不同，这些细胞具有特殊的结构，其中包括细胞核，和可以进行光合作用的触角。 他们还能进行有性繁殖，这大大的加快了进化的速度。

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We are family: Scientists suspect that a large DNA-based virus took up residence inside a bacterial cell more than a billion years ago to create the first cell nucleus.

病毒跟我们是一家人：科学家认为，十多亿年前一个大的DNA病毒在细菌细胞内居住并形成了第一个细胞核。

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