ANATOMY

Detailed explanation-1: -Many viruses have either DNA or RNA as the genetic element and the nucleic acid with single or double strands. The whole infectious virus, called as virion has nucleic acid and an outer shell of proteins. The simplest virus includes DNA or RNA for encoding four proteins and the most complex encodes 100-200 proteins.

Detailed explanation-2: -Viruses are classified by phenotypic characteristics, such as morphology, nucleic acid type, mode of replication, host organisms, and the type of disease they cause.

Detailed explanation-3: -Viruses are smaller and simpler in construction than unicellular microorganisms, and they contain only one type of nucleic acid-either DNA or RNA-never both.

Detailed explanation-4: -Group I viruses contain double-stranded DNA (dsDNA) as their genome. Group II viruses have single-stranded DNA (ssDNA) as their genome. Group III viruses use dsRNA as their genome. Group IV viruses have ssRNA as their genome with a positive polarity. More items