Viral genomes can be composed of either RNA or DNA

Viral genomes may be composed of either RNA or DNA. The genomes of RNA viruses can be either single-stranded RNA or double-stranded RNA, and might contain one or greater separate RNA molecules (segments: monopartit or multipartit genome). DNA viruses can have either unmarried-stranded or double-stranded genomes. Maximum DNA virus genomes are composed of a unmarried, linear molecule of DNA, but some are made up of a round DNA molecule. There also are viral RNA called unmarried stranded RNA: serves as template for mRNA synthesis single stranded RNA: serves as template for DNA synthesis. Viral envelope[20] is a outer layer of membrane that viral genomes use to enter the host cell. a number of the classes of viral DNA and RNA consists of a viral envelope even as a few do now not