_____ can be single- or multi-celled and have organization within their structure.
Prokaryotes are unicellular organisms, found in all environments. Prokaryotes are the largest group of organisms, mostly due to the vast array of bacteria which comprise the bulk of the prokaryote classification.
No nuclear membrane (genetic material dispersed throughout cytoplasm)
No membrane-bound organelles
Simple internal structure
Most primitive type of cell (appeared about four billion years ago)
Escherichia coli (E. coli)
Eukaryotes are generally more advanced than prokaryotes. There are many unicellular organisms which are eukaryotic, but all cells in multicellular organisms are eukaryotic.
Nuclear membrane surrounding genetic material
Numerous membrane-bound organelles
Complex internal structure
Appeared approximately one billion years ago