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Biology

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Biology

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Viruses

Prophage Integration in Bacteria

Description

The lysogenic cycle shows how bacteriophages can infect bacteria without killing the host right away. In this cycle, the phage genome joins the bacterial genome. The integrated phage DNA is called a prophage, and the bacterium copies it each time it replicates.

Some prophages can switch back into...

Transcript

当噬菌体数量较多时, 会进入另一种繁殖模式, 叫溶源周期。 这种模式下噬菌体可以 不杀死宿主细胞就进行繁殖。 它的初期步骤和裂解周期相似。

噬菌体首先吸附在宿主细胞上 并注入DNA。 但是,噬菌体的DNA进入细胞内后 会和宿主的染色体整合 形成原噬菌体。 原噬菌体本身并不活跃 不会主动繁殖新的噬菌体。 但当宿主细胞分裂时, 它便会和宿主DNA一起复制。

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