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Syracuse UniversityB ogle Welcome, Al.. .board Learn Sapling Learning Jump to... macmil an learning Print CalculatorPeriodic Table 5 of 20 Sapling Learning macmiianlanig Most organisms use DNA as their genetic material. RNA viruses are able to use RNA instead. What molecular mechanisms allow these viruses to use RNA as their genetic material instead of DNA? Single-stranded viral RNA can be transcribed by reverse transcriptase Double-stranded RNA is used to generate mRNA that is translated into viral proteins The viral particle is covered by a mix of viral RNA and glycoproteins. Viral RNA catalyzes all of the reactions necessary for viral replication Viral RNA can act like mRNA and be translated into viral proteins by the host cell. O Previous Give Up & ew Solution e, Check Answer 0 Next Hint RNA viruses use a variety of mechanisms to transcribe and translate their genome. Consider the possible way in which viral RNA could be transcribed and replicated to produce viral proteins and replicate the viral genome

Explanation / Answer

RNA -Dependent RNA Polymerase

some viruses like f2 R17 contain RNA as genomes, in these viruses having enzyme called RNA dependent RNA polymerase or RNA replicase, with the help of this enzyme viruses are replicated in host cell. synthesis new RNA strand proceeds in 5'to 3' direction and chemical mechanism is similar to DNA dependent transcription.

Reverse Trnascriptase

RNA -Dependent DNA polymerse ( reverse transcriptase) catalysis the synthesis of DNA strand complimentary to the RNA, eg; retro viruses

It has several enzyme activity

1,RNA dependent DNA Synthesis

2.DNA dependent DNA Synthesis

3.RNase-H Activity

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