These are small, circular DNA molecules. These sections of genetic material, derived from the same or different species, are capable of duplicating themselves in the host cell. Although the various classifications of microbes have similar functions or uses in biotechnology, they are distinctly different. Fungi are a group of organisms which include microbes like land and aquatic moulds, and yeasts. They feed on organic matter.
Yeast is a general term for single-celled fungi that reproduce by budding.
Yeast is the key component in the creation ethanol, an environmentally friendly fuel produced through the use of fermentation . This is the process of growing certain yeasts in order to produce various chemical compounds, like ethanol. Bacteria are members of a large group of microorganisms with a very simple cell structure. Some bacteria manufacture their own food, others live in association with other organisms and some live on organic matter. One of the most important uses of bacteria is as tools to study inheritance and expression of genetic trails.