Bacteria Essay Research Paper True cells

Bacteria Essay, Research Paper

True

cells with a wall, membrane, cytoplasm, ribosomes and DNA. No

distinct nucleus DNA

not incorporated in chromosomes but comprising a single, circular strand Bacteria

may have plasmids = a

circle of a few genes which can move between bacteria. These may contain

antibiotic resistant genes. These are often used as a vector in genetic

engineering. Membrane?bounded

organelles are absent Cell

wall of protein and polysaccharide Motile

if possess flagella Spherical

(cocci), rod shaped (bacilli) or spiral shaped (spirilla) Most

are heterotropic ? obtaining energy from the oxidation of breakdown of

organic matter. They are

parasitic, saprobiontic or mutualistic. Some

are chemaoautotrophic ? obtaining energy from the oxidation of inorganic

materials Some

are photoautotrophic Bacteria

reproduce by binary fission Bacteria

are a source of antibiotics Pathogenic

bacteria are intercellular parasites and the symptoms of a disease are

often caused by the toxins they produce.