Lytic cycle.
<P>
   A  virulent  phage  such  as T4 reproduces only by a lytic cycle which
   leads to lysis of the host.
<P>
<Li> T4 uses its tail fibers to bind to receptors on a bacterial cell.
<Li> Phage DNA is injected.
<Li> Host resources are used to produce viral DNA and proteins.
<Li> Viral DNA is packaged in the head, attached to tail apparatus.
<Li> Progeny phages burst (lyse) the host cell.
<P>
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