Can someone explain to me + and - RNA viruses ?

[Kobebucsfan]

So (+) RNA virus is basically mRNA, but why does it change into -RNA and then back into +RNA inside the host cell?


so -RNA uses it RNA dependent RNA pol and turns into +RNA?

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[Phloston]

So (+) RNA virus is basically mRNA, but why does it change into -RNA and then back into +RNA inside the host cell?


so -RNA uses it RNA dependent RNA pol and turns into +RNA?

http://forums.studentdoctor.net/threads/viral-replication.949659/

http://forums.studentdoctor.net/thr...onal-consequences-of-virus-structure.1067728/

 

[Transposony]

So (+) RNA virus is basically mRNA, but why does it change into -RNA and then back into +RNA inside the host cell?

mRNA can make all the protein (i.e. RNA Polymerase) but can't make it's own genome unless it changes into (-) RNA ( an intermediate) to replicate itself.

 

[Transposony]

so -RNA uses it RNA dependent RNA pol and turns into +RNA?

Yes, it has to carry it's own RNA Polymerase to do so.