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| Protoctist. A microscopic, single celled organism, can be either animal cell like or have chloroplasts and more plant cell like. | Chlorella is a plant like version, an algae. An Amoeba is an animal cell type that live in ponds. |
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| Bacteria. Bacteria are: Microscopic single celled organisms, they don't have a nucleus. They have a circular chromosome of DNA. Some can photosynthesise. Most bacteria feed off of other organisms. | Lactobacillus bulgaricus. This bacteria is rod shaped and used in the production of yoghurt, to turn milk sour. Pneumococcus is round shape and causes pneumonia. |
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| Viruses. Viruses are particles, rather than cells. They are smaller than bacteria. They can only reproduce inside living organisms, this makes viruses parasites. | They come in all shapes and sizes and infect all living organisms. They do not have a cellular structure. They have a protein coat, covering genetic material, either DNA or RNA. |
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| Organisms as Pathogens. Some organisms are Pathogens, Pathogens are organisms that cause disease. That can include some fungi, Protoctists, bacteria and viruses. | Protoctist. Plasmodium is a protoctist that causes malaria. Bacterium. Pneumococcus is a bacteria pathogen that causes pneumonia. Viruses. Influenza virus which causes flu. |
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