BRAINCAKEKingdoms
Before the three-domain system, the highest rank was the kingdom. The widely used five-kingdom system, proposed by Robert Whittaker in 1969, places organisms into five kingdoms based on cell structure, body organisation and type of nutrition.
Prokaryotae (Monera): all prokaryotes; no nucleus or membrane-bound organelles, 70S ribosomes, circular DNA, mostly single-celled. Example: bacteria.
Protoctista: eukaryotes that do not fit into the animal, plant or fungus kingdoms. Mostly single-celled; some are autotrophic (algae) and some heterotrophic. Examples: Amoeba, Paramecium, seaweeds.
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More in Classification
- Identifying a Species
- DNA Barcode
- DNA Analysis and Proteomics
- New Evolutionary Models
- Biochemical Relationships
- More Biochemical Relationships
- Gel Electrophoresis
- Domains
All 19 lessons in Classification · All Edexcel AS-level Biology topics