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