ANSWERS: 2
  • rna, ribosomal
  • 1) "Casjens and Kings(1975) classified virus into 4 groups based on type of nucleic acid ,presence of envelope,symmetry and site of assembly. It is as follows: Single Stranded RNA Viruses Double Stranded RNA Viruses Single Stranded DNA Viruses Double Stranded DNA Viruses" 2) "DNA viruses For more details on this topic, see DNA virus. - Group I: viruses possess double-stranded DNA and include such virus families as Herpesviridae (examples like HSV1 (oral herpes), HSV2 (genital herpes), VZV (chickenpox), EBV (Epstein-Barr virus), CMV (Cytomegalovirus)), Poxviridae (smallpox) and many tailed bacteriophages. The mimivirus was also placed into this group. - Group II: viruses possess single-stranded DNA and include such virus families as Parvoviridae and the important bacteriophage M13." "RNA viruses For more details on this topic, see RNA virus. Group III: viruses possess double-stranded RNA genomes, e.g. rotavirus. These genomes are always segmented. Group IV: viruses possess positive-sense single-stranded RNA genomes. Many well known viruses are found in this group, including the picornaviruses (which is a family of viruses that includes well-known viruses like Hepatitis A virus, enteroviruses, rhinoviruses, poliovirus, and foot-and-mouth virus), SARS virus, hepatitis C virus, yellow fever virus, and rubella virus. Group V: viruses possess negative-sense single-stranded RNA genomes. The deadly Ebola and Marburg viruses are well known members of this group, along with influenza virus, measles, mumps and rabies." "Reverse transcribing viruses For more details on this topic, see Reverse transcribing virus. Group VI: viruses possess single-stranded RNA genomes and replicate using reverse transcriptase. The retroviruses are included in this group, of which HIV is a member. Group VII: viruses possess double-stranded DNA genomes and replicate using reverse transcriptase. The hepatitis B virus can be found in this group." Source and further information: http://en.wikipedia.org/wiki/Virus_classification#Virus_classification 3) "A DNA virus is a virus that has DNA as its genetic material and replicates using a DNA-dependent DNA polymerase. The nucleic acid is usually double-stranded DNA (dsDNA) but may also be single-stranded DNA (ssDNA). DNA viruses belong to either Group I or Group II of the Baltimore classification system for viruses. Single-stranded DNA is usually expanded to double-stranded in infected cells. Although Group VII viruses such as hepatitis B contain a DNA genome, they are not considered DNA viruses according to the Baltimore classification, but rather reverse transcribing viruses because they replicate through an RNA intermediate." Source and further information: http://en.wikipedia.org/wiki/DNA_virus

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