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To stay healthy, your cells must continuously perform a wide variety of chemical tasks. Your DNA genes, in the nucleus of every cell, help orchestrate this activity. A cell uses its genes as a kind of biochemical cookbook: whenever it has to do anything, a cell looks up the recipe in its DNA. It then uses this recipe to cook up whatever proteins it needs to get the job done. Your cells are hard at work right now, creating thousands of tailor made proteins for thousands of different biochemical jobs. Sometimes, however, things can go wrong. When a virus attacks, it injects its own DNA into one of your cells. Like your own genes, the viral DNA contains recipes. Unfortunately, these recipes are only good for making new viruses.
為了保持健康，你的細胞必須不斷地進行各種各樣的化學反應。你的DNA基因，存在于每一個細胞的細胞核，會幫助協調這項活動。細胞用它的基因作為一種生化食譜：無論何時細胞在工作的時候，它都要在DNA查詢配方。然后，它使用這個配方來烹煮蛋白質所需的物質，從而完成化學反應。此刻你的細胞都在努力工作，創造數以千計由蛋白質形成的“裁縫”來完成數千項不同的生化反應。然而，有時候，事情會出差錯。當病毒攻擊時，它將自身的DNA注入到你的細胞中。像你自己的基因一樣，病毒的DNA也包含有食譜。不幸的是，這些食譜只對產生新的病毒有利。
