Prokaryotae

Prokaryotes(bacteria) are unicellular organisms with no nucleus or membrane-bound organelles.They make food by photosynthesis or take in food by extracellular digestion.The genetic material is a loop of DNA which is free in the cytoplasm, folded and condensed by non-histone proteins('naked' DNA).The 70S ribosomes are smaller than the 80S ribosomes found in eukaryotic cells.Prokaryotes may have small, circular loops of extra-chromosomal DNA in the cytoplasms called plasmids.The cells have a cytoskeleton, but the cytoskeleton is more complex in eukaryotes.The cells of prokaryotes have a cell surface membrane. Prokaryotes have a cell wall made of peptidoglycan(murein).