SME
Principles of Biology II
Biodiversity
Use this for “Sulfolobus lives in acidic hot springs. Is it a bacterium, an archaeon or a eukaryote?”
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Which domain does it belong to?
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Archaea look like bacteria but share key genes with eukaryotes.
Assumptions
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The three domains come from comparing ribosomal RNA sequences, not from how the cells look.
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Bacteria and archaea are prokaryotes: single cells with no nucleus and no membrane-bound organelles.
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Bacteria build their walls from peptidoglycan; archaea have none, and their membrane lipids are ether-linked.
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Eukarya have a nucleus in every cell: protists, fungi, plants and animals.
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