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Chemical Composition and Mode of Replication: The genome of a virus may consist of DNA or RNA, which may be single stranded (ss) or double stranded (ds), linear or circular. The entire genome may occupy either one nucleic acid molecule (monopartite genome) or several nucleic acid segments (multipartite genome).
3 lip 2017 · It provides examples of plant, animal, and bacterial viruses. It specifically examines the structure and replication of Cauliflower Mosaic Virus, a plant virus with circular double-stranded DNA genome. Viruses are small, acellular particles that can replicate only in a host cell.
The infectious virus particles, or virions, are composed of proteins and are surrounded in some species of viruses by a lipid membrane, which is referred to as an envelope; the particles contain only one kind of nucleic acid, either DNA or RNA.
1 sty 1996 · Viruses are small obligate intracellular parasites, which by definition contain either a RNA or DNA genome surrounded by a protective, virus-coded protein coat.
While cells contain double-stranded DNA for their genome, viruses are not limited to this form. While there are dsDNA viruses, there are also viruses with single-stranded DNA ( ssDNA ), double-stranded RNA ( dsRNA ), and single-stranded RNA ( ssRNA ).
Infectious virus particles – also referred to as virions – are constituted of various basic elements (Fig. 2.1): inside, they contain an RNA genome or a DNA genome. Depending on the virus type, the nucleic acid is single-stranded or double-stranded, linear, circular or segmented.
The viral genetic material can be composed of DNA or RNA, which can be either single- or double-stranded, or gapped (e.g., hepatitis B virus, HBV). Viral genomes can have a linear or circular topology, and for many viruses the genomic ends contain repeated sequences, chemical modifications, or secondary structures with regulatory functions [3] .
