Domain ➔ kingdom ➔ phylum ➔ class ➔ order ➔ family ➔ genus ➔ species

A mnemonic that may help you remember this is 'Did King Philip Came Over For Good Soup'.

Each species is identified by a two part name consisting of the genus and the species.

For example, Homo sapiens.

1. Prokaryotae (prokaryotes)
2. Protoctista (unicellular eukaryotes)
3. Fungi (such as yeasts)
4. Plantae (plants)
5. Animalia (animals)

1. Archaea
2. Bacteria
3. Eukarya

1. Biological species concept - defines a species as a group of organisms that can reproduce to produce fertile offspring
2. Morphological species concept - classifies species based on observable physical traits
3. Ecological species concept - defines a species by its ecological niche, which is the way it interacts with its environment

1. Archaea membranes have unique membranes (containing fatty acids that are bound to glycerol by ether linkages)
2. Archaea have a more complex form of RNA polymerase
3. Only Bacteria have peptidogylcan (murein) in their cell walls
4. The genes and protein synthesis in Archaea are more similar to Eukarya than Bacteria

1. Mainly unicellular organisms (some simple multicellular organisms)
2. Have a nucleus and other membrane-bound organelles
3. Some have chloroplasts with chlorophyll to carry out photosynthesis and so are autotrophic
4. Some ingest other organisms and so are heterotrophic
5. Some are parasitic

1. Some are unicellular and some are multicellular
2. Have a nucleus and other membrane-bound organelles
3. No chloroplasts
4. Body made of hyphae
5. Cell wall made of chitin
6. Reproduce by spores
7. Obtain food by absorbing dissolved organic material and so are saprophytic

1. Multicellular
2. Have a nucleus and other membrane-bound organelles
3. Contain chloroplasts with chlorophyll to carry out photosynthesis and so are autotrophic
4. Cell walls made of cellulose
5. Store sugars in the form of starch

1. Multicellular
2. Have a nucleus and other membrane-bound organelles
3. No cell walls
4. No chloroplasts
5. Ingest other organisms and so are heterotrophic
6. Store sugars as glycogen

Viruses are classified by the type of nucleic acid (RNA or DNA) and whether this is single stranded or double stranded.