What are Bacteria and why study them?
The domain Bacteria includes prokaryotes, whose cells lack a nucleus or other internal structures surrounded by membranes. Cyanobacteria are a class of photosynthetic bacteria. Although some bacteria cause disease in humans, plants and animals, most species are probably free-living (not parasites), and thus harmless. Bacteria are critical for the proper functioning of ecosystems because they decompose dead organisms and thereby recycle organic material back into mineral nutrients.
