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Gen.char.of microorg.
- 2. They are prokaryotic organisms(kingdom monera)without cell defined organelles like mitochonmdria,golgi bodies, ER etc. Microscopic, unicellular may occur single or in aggregate to form colonies. Possess rigid cell wall, made of peptidoglycan and lipopolysaccharides. No well defined nucleus ,DNA is not enclosed in nuclear membrane Ribosome's are scattered in cytoplasm and are of 70S type. Most are heterotrophic some are autotrophic possesses bacteriochlorophyll.
- 3. Motile bacteria possess one or more flagella They cannot pass through bacterial filters. Common method of multiplication is binary fission. True sexual reproduction is lacking.
- 4. Smallest unicellular organisms that are obligate intracellular. They are most primitive org.infecting man. Obligate intracellular Possess either DNA or RNA ,but never both Can pass through bacterial filters Cant grow on artificial cell free media. Multiply by complex method. Do not have proper cellular organization. Don’t have cell wall or cell membrane or cellular organelles. They lack they enzyme necessary for synthesis of nucleic acid and protein.
- 5. Not susceptible to antibacterial antibiotics. They are enclosed in a protective envelope. They do not respire, do not metabolize and do not grow but they do reproduce They are considered both as living and non living things, as viruses are inactive when they are present outside of host cells and are active in side of host cells. As they make use of raw materials and enzymes of the host cell to reproduce. In the year 1897, a scientist named Beijerinck discovered and coined the term virus. The term virus is derived from Latin word-“virus” means poison.
- 6. They can only be seen with an electron microscope Their size ranges from 20 nanometers (parvovirus) to 400 nanometers (poxvirus).
- 7. ‘fungus’ Greek “mykes” meaning mushroom. Their study is called mycology. Eukaryotic and possess all eukaryotic cell organelles such as mitochondria . Possess rigid cell wall, composed of Chitin, beta- glucans and other polysaccharides. Cell membrane contains ergosterol instead of cholesterol. Fungi can be unicellular, multicellular, or dimorphic, which is when the fungi is unicellular or multicellular depending on environmental conditions. Lack chlorophyll Divide asexual or sexual means by producing spores.
- 8. Fungi like to be in a moist and slightly acidic environment; they can grow with or without light or oxygen
- 9. THANKS…