krishie
Forum Senior
Topics: 17
Posts: 128
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Hi everybody,
This is about positive sense rna viruses.If they can serve as their own mrna,why do they need a negative intermediate replicative form?And negative sense rna viruses use a positive sense intermediate,rt?Please clarify this point for me.Thanx.
Krishie
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krish
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| ssrpk
Forum Fanatic
Topics: 154
Posts: 2,795
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hi,
if u remember the base sequenc in nucleic acids .....while replicating as occur during mitosis nucleic acids first form an intermediate which has complimentary base sequences than the original one...and then the intermediate strand transcribes the new strand from those complimentary bases.....
so genome nucleic acid of bacteria will hv it's complimentary base sequnces on the intermediate DNA or RNA ......
don't get confused with polarity (+/-) it only denotes whther tht nucleic acid for eg. mRNA is able to translate into rRNA in which case it wud be +ve OR if it requires to be first transcribed to undergo translation to rRNA then it wud be hvin -ve polarity
hope it helps 
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| krishie
Forum Senior
Topics: 17
Posts: 128
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Hi,
thanx a lot!This thing was really getting on my nerves,u really made it easy for me.I was missing that one link which u gave me.Thanx.
regards,
Krishie
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krish
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