The viruses with different kinds of genomes that combine and share the genetic content in their progeny. Introduction: Viruses are very diverse in nature. Viruses are often classified based on the relatedness of their gene sequences. This criterion of classification becomes problematic when the viruses recombine their genome within the host, which is infected by them. Hence, the viruses are classified based on the virion structure and the host range along with the genome composition.

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Chapter 6.3, Problem 1TQ

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The viruses with different kinds of genomes that combine and share the genetic content in their progeny.

Introduction:

Viruses are very diverse in nature. Viruses are often classified based on the relatedness of their gene sequences. This criterion of classification becomes problematic when the viruses recombine their genome within the host, which is infected by them. Hence, the viruses are classified based on the virion structure and the host range along with the genome composition.

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The table below shows the properties of the genomes of three different viruses. The data were obtained as follows: Nuclease sensitivity was measured by the ability of deoxyribonuclease (DNase) or ribonuclease (RNase) to destroy the genome (a “+" means sensitivity). The ability of the genome to act as mRNA was tested by incubating it in a cell-free system. If amino acids were incorporated into protein, the data are shown as a Finally, the virus particles were tested for the presence of a virion polymerase. If an enzyme was present, the data show whether it could polymerize deoxynucleotide triphosphates (DNTPS) or nucleoside triphosphates (NTPS). "+. Genome Properties Nuclease Virion Can Genome Sensitivity? Polymerase? Be an mRNA? Virus DNase RNase With With DNTPS NTPS #1 - - #2 - - #3 For each virus, indicate the strategy of the genome, using the Baltimore classification. What is the nature of the product of the virion polymerase when present? + + + + + +

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Which biological system contains a protein nucleocapsid surrounding 2 antiparallel polynucleotide strands (held together by hydrogen bonds), with deoxyribose sugars, but no ribose sugars? a single-stranded RNA viroid (like avocado sun blotch viroid) a double-stranded RNA virus (like the reovirus family) a single-stranded DNA virus (like fX174 virus of E. coli) a double-stranded DNA virus (like the smallpox virus) a single-stranded RNA virus (like tobacco mosaic virus)