A bacterial cell consists of following components
Cell envelope It is the outer covering of protoplasm of bacterial cell. It contains mucilage sheath, cell wall and plasma membrane.
Cytoplasm It is a crystallo-colloidal complex that forms the protoplasm excluding its nucleoid. Membrane bound cell organelles are absent.
Nucleoid It represents the genetic material of prokaryotes. Nucleoid consists of a single circular strand of DNA duplex which is super coiled with the help of RNA.
Plasmids These are self-replicating, extrachromosomal segments of double-stranded, circular, naked DNA.
Flagella These are unstranded, equivalent to a single microtubular fibre. These help in movement.
Pili and fimbriae Pili are longer, fewer and thicker tubular outgrowths made up of protein pilin. Fimbriae are small bristle-like fibres sprouting from cell surface in large number. Pili are helpful in attaching to recipient cell and forming conjugation tube. Fimbriae cause agglutination of RBC. They also help in mutual clinging of bacteria.