LYCOS RETRIEVER 
Viruses (Living Thing): Hosts
built 255 days ago
Viruses (Living Thing) also shows up in the Retriever categories:
Viruses (Malicious Software) , and more.
Viruses (Malicious Software) , and more.
In the lysogenic cycle the host cell does not make more viruses, but simply harbors the entire viral genome in the cell, usually by incorporating it into the cell's genome. If the virus is an RNA virus, as many are, the RNA must first undergo "reverse transcription" into DNA. While harboring the viral genes, the cell may grow and multiply normally, carrying the new instructions harmlessly along with it. A virus carried in this manner is said to be latent. Recently scientists have learned that even during latency, some of the virus's genes can be expressed (8).
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Once formed, the viruses may escape the host cell when the host cell disintegrates. Alternately, the new viruses may force their way through the plasma membrane of the cell and assume a portion of the plasma membrane as a viral envelope. In either process, the cell is often destroyed and hundreds of new viruses are produced.
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[V]iruses could easily provide a way for new genes never before encountered by a species to become part of its genome. That viruses install new genes into their hosts is not speculative — it is a well known fact. That transferred genes are important in evolution is becoming well established. According to Cosmic Ancestry, the horizontal transfer of genes by viruses and other means is essential for evolution.
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