Prokaryotic cells ‘Pro’ = before ‘karyon’ = nucleus

Cell structure Function Cell wall Physical barrier, protects against mechanical damage and entry of some substances Flagellum Propels the bacterium along Mesosome Site of respiration. May be involved in cell division and DNA uptake Chromosome/DNA Possesses the genetic information needed to replicate new cells

Cell structure Function Plasmids Circles of DNA able to replicate independently of the main circular chromosome. They possess genes which aid survival of bacteria in adverse conditions Glycogen granules Store of carbohydrate for respiration Lipid droplets Concentrated store used in respiration Cell membrane Partially permeable forming selective barrier between cell contents and external environment. Controls passage of substances into and out of cell