Biology A2 · Classification, biodiversity and conservation. The idea in plain words, the rules to remember, the mistake to avoid and a worked example, written and checked by Mega Lecture.
Biologists sort organisms into groups that show how they are related. The basic unit is the species, but there is more than one way to define it: by breeding, by structure or by the niche the organisms fill.
All cellular life is placed in three domains: Archaea, Bacteria and Eukarya. Archaea and Bacteria are both prokaryotes, yet they differ in their membrane lipids, their ribosomal RNA and their cell walls. Eukarya have cells with a nucleus and are divided into four kingdoms.
Below domain the groups get smaller step by step, from kingdom down to species. Viruses are not cells, so they sit outside the domains and are grouped by their nucleic acid.
Students put Archaea and Bacteria in one group because both are prokaryotes. They are two separate domains.
Answer: It is a single-stranded DNA virus.
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