Dichotomous Key/Start

1 2: Membrane-bound nucleus absent; No true chromosomes, only plamids; Usually unicellular, though some cyanobacteria are multicellular; Lysosomes and peroxisomes absent; Endoplasmic reticulum, golgi apparatus, and mitochondria absent; cell size is 1 to 10 micrometers 3: Membrane-bound nucleus present; Multiple chromosomes present; usually multicellular; lysosomes and peroxisomes present; Endoplasmic reticulum, golgi apparatus, and mitochondria present; cell size is 10 to 100 micrometers 2 Archaea: Cell membranes contain ether linkages; three RNA polymerases present. Bacteria: Cell membranes contain ester bonds and cell wall made of peptidoglycan; one RNA polymerase 3 Animalia: Cell wall absent; Nutrients ingested; Movement possible with muscular contractions, cilia, flagella, or other organ 4: Cell wall present; Nutrients absorbed, though rarely carnivorous; Very limited movement 4 Plantae: Chlorophyll present; Plant walls made of cellulose Fungi: Chlorophyll absent; Plant walls made of chitin __NOTOC__ fr:Clés dichotomiques/Départ