Micro-organisms are tiny living things that can only be seen with a microscope. They include bacteria, viruses, and fungi. Bacteria are single-celled microbes that come in different shapes and sizes, and can cause both disease and cure infections. Viruses are even smaller and rely on host cells to reproduce. Fungi feed on dead and living organic matter and include mushrooms and yeasts. Micro-organisms play important roles like decomposing waste, recycling nutrients, and aiding in food production.

1. By Mohammad Osama Hassan Ally

2. Do you know what they are? Its is an individual living system, such as animals and plants, that is capable of reproduction and growth ; and can only be seen through using a microscope . Micro-organisms include, and can be classified as bacteria , virus and fungi . Classification of micro-organisms: Bacteria: A large group of single-cell (made of one cell) microorganisms. Some cause infections and disease in animals and humans. The singular of bacteria is bacterium. Virus: Microscopic organism that relies on the genetic machinery of living cells to grow and reproduce (enters other cells and infect them) causing infections. Fungi: A group of organisms that lack chlorophyll (help in photosynthesis to make food) and obtain nutrients from dead or living organic matter (natural material)

3. Bacteria: Are a singular cellular micro-organism, that vary in shapes and sizes. Some cause infections and disease , while others cure infections and disease . They reproduce asexually. Bacterium grow on soil, hot springs, radioactive material , sea water, and even in the Earth’s crust. Fact! There are around 40 million bacterial cells in a gram of soil, and 1 million bacterial cells in a millimetre of water. Where can I find them: M any foods and medicines involve bacteria produced; EG insulin producing bacteria genetically engineered to cure illnesses such as diabetes .

4. Mitosis (Asexual Reproduction ) Don't Click Here!

6. Virus: They are smaller than bacteria, and reproduce by effecting a host cell. They have a protein coating rather than a cell membrane. They contain DNA. Example: AIDS: Acquired immune deficiency syndrome is a set of symptoms and infections resulting to the damage of the human immune system caused by the human immunodeficiency (act of damaging the immune system) virus (HIV ).

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9. Fungi: Organisms that use living or dead organisms as food by breaking them down and then absorbing the substances into their cells. Fungi make up one of the five kingdoms of living things on Earth. Mushrooms, yeast and molds are types of fungi. Example: Basidiomycetes: They look a bit like clubs or baseball bats. This division includes mushrooms, puffballs and earth stars. They could be found in forests or farmed as vegetables, for eating.

11. Bacteria is involved in the decomposition of plants and animals. Its is done by breaking down complex molecules into smaller simple molecules. Bacteria is largely responsible for the recycling of carbon, nitrogen and sulphur. The Role of Bacteria In The Nitrogen Cycle:

12. Help preserve food Keep us healthy Breakdown harmful substances Protect us from invading bacteria's Provide us with chemicals we may be deficient of (insulin) Prepare foods such as yogurts and cheese. Yeast cells are used in the preparation of this yogurt.

13. THANK YOU FOR WATCHING 14/05/2008 By Mohammad Osama Hassan Ally