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“Viral elements are a large part of the genetic material of almost all organisms,” said Dr. Sharp, who won a Nobel Prize for elucidating details of our genetic code. Base for nucleic base, he said, “we humans are well over 50 percent viral.” Scientists initially dismissed the viral elements in our chromosomes as so much tagalong “junk DNA.” But more recently some researchers have proposed that higher organisms have in fact co-opted viral genes and reworked them into the source code for major biological innovations, according to Luis P. Villarreal, director of the Center for Virus Research at the University of California, Irvine. Some genes involved in the growth of the mammalian placenta, for example, have a distinctly viral character, as do genes underlying the recombinant powers of our adaptive immune system — precisely the part that helps us fight off viruses. In fact, it may well have been through taking genomic tips from our viral tormentors that we became so adept at keeping them at bay.
I know that there is at least one category of virus that basically hijacks a bacteria cell, I cant quite remember the name of the virus but I know it lead to most of what we know about Deoxyribonucleic Acid and it also lead to discoveries involving the modification and cutting of DNA.
Do they destroy the cell or reproduce without doing so?