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Bacteria share genes all the time. RMS would approve
(sh.itjust.works)
Hey bro, can I have some antibiotic resistance?
Sure bro, but remember that the heavy metal tolerance gene is a dependency.
Shit, I'm on python 2 but hmrA requires python 3.
Lol, Junk DNA is rarely used functions and deprecated code. :-}
Btw, useless fragments of virus's "imports" are there too, right? And some accidents and jumping sequences too. DNA is wild.
Rarely used stuff isn't junk DNA. It is still part of the genome, just expressed only under certain conditions (like stress).
Viral sequences do get embedded in host DNA. Some stay mostly inactive, others keep jumping around (and shuffling our genes in usually harmful but occassionally useful combinations) and yet others actually become useful to the host.
Not a biologist but have to understand some biology and my understanding is that the current consensus is that most of that junk DNA isn't actually junk and serves some purpose. We just have a very poor understanding of what that is or how it works.