Lesson 2.5: Classification of Prokaryotes Flashcards
What are prokaryotes
lack nucleus and other membrane-bound organelles
describe the two groups of prokaryotes
bacteria- most abundant domain
archaea- single-cell; extreme conditions
What is the two domain system and explain how it was debunked?
the two-domain system consisting of archaea and bacteria was proposed in 1970 through rRNA it was revealed that archaea are more related to eukaryotes than to bacteria
What are the three domains of life
Bacteria
Eukarya
Archaea
How are the domains further classified
genotype: DNA sequences to reveal evolutionary relationships
Phenotype: observable characteristics: cell shape, size, motility, and metabolic pathways
Ecology: environment and ecological niche
_____ are the fundamental units of biological diversity
species
most widely accepted species concept
polyphenetic species concept
Levels of classification
Kingdoms: not universally adopted
Phyla
Classes
Orders
Families
Genera
Species
Committee responsible for maintaning and updating ICNB
International Committee on Systematics of Prokaryotes ICSP
Additional points for nomenclature of prokaryotes
Separate systems: independent naming codes
Not static: periodically revised