IIR : 1. Inject mouse with live type IIIS bacteria - Mouse died and Type IIIS bacteria were recovered from the mouse’s blood. 2. Inject mouse with live type IIR bacteria - Mouse survived; No living bacteria isolated from the mouse’s blood. 3. Inject mouse with heat-killed type IIIS bacteria - Mouse survived; No living bacteria isolated from the mouse’s blood. 4. Inject mouse with live type IIR + heat-killed type IIIS cells - Mouse died; Type IIIS bacteria recovered from the mouse’s blood Copyright
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BACTERIA. CLASSIFICATION Bacteria are extremely small and some can be just seen with the naked human eye. They are much smaller than eukaryotic cells but are still very complex despite their size. .the cell is surrounded by a cell membrane that enclosees the bacteria cell. They are single celled organisms. Bacteria are prokaryotic cells and therefore do not have a nucleus and do not have a lot of organelles like: mitochondria‚ chloroplasts‚ and other organelles that are usually found in eukaryotic
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young life that has been taken by the infection of a killer disease. It’s a painful thought to know that person never got to live to see their full potential. Diseases kill children every year. Many diseases are bacteria‚ inhaled by the victim‚ infecting several areas of the body. The bacteria lives and grows while its victim dies. Other diseases are caused by viruses; a non-living infection that attacks the disease-fighting system and other living cells. Children are much more able to be hurt by disease
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and Staphylococcus albus Some bacteria’s require a certain amount of light in order to function properly and there fore survive. Escherichia coli is found in the gut and intestines of mammals. Staphylococcus albus is generally a skin dwelling bacteria Aim: To test whether the amount and type of light that the bacteria’s E.coli and S.albus are subject to causes changes in their growth rates and habits. To test whether the growth rates and habits of the bacteria’s E. coli and S. albus are
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Bacterial Biology Bacteria are one-celled prokaryotic organisms that lack a true nucleus (i.e.‚ a nucleus defined by a membrane). Bacteria maintain their genetic material‚ deoxyribonucleic acid (DNA)‚ in a single‚ circular chain. Bacteria also contain DNA in small circular molecules termed plasmids. The Dutch merchant and amateur scientist Anton van Leeuwenhoek was the first to observe bacteria and other microorganisms. Using single-lens microscopes of his own design‚ he described bacteria and other microorganisms
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slow down the growth of bacteria. The Greek word anti means "against"‚ and the Greek word bios means "life" (bacteria are life forms). Antibiotics are used to treat infections caused by bacteria. Bacteria are microscopic organisms‚ some of which may cause illness. The word bacteria is the plural of bacterium. How do antibiotics work? Although there are a number of different types of antibiotic they all work in one of two ways: • A bactericidal antibiotic kills the bacteria. Penicillin is a bactericidal
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utilized for bacterial growth are referred to as nutrients. Many bacteria can be identified in the environment by inspection or using genetic techniques. The nutritional requirements of a bacterium such as E Coli are revealed by the cell’s elemental composition. These elements are found in the form of water‚ inorganic ions‚ small molecules and macromolecules which serve either a structural or functional role in the cells. Bacteria thrive by four things oxygen‚ food (nutrients)‚ warmth and time
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____ 1. Bacteria and archaea differ in a.|the presence of a membrane-bound nucleus.| b.|the makeup of their cell walls.| c.|size.| d.|the presence of a cell wall.| ____ 2. Which of the following is NOT found in bacteria? a.|cell wall| b.|membrane-bound nucleus| c.|ribosome| d.|plasma membrane| ____ 3. Unlike bacteria‚ archaea a.|have cell walls.| b.|are prokaryotes.| c.|have two plasma membranes.| d.|are thought to be closely related to eukaryotes.| ____ 4. Bacteria that cause
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Title Antimicrobial properties in different type of plants. Introduction A substance that kills or prevents the growth of microorganisms for example bacteria‚ fungi or protozoans is called an antimicrobial. This substance has 2 major roles which are to either kill microbes (microbiocidal) or prevent the growth of microbes (microbiostatic). Disinfectants are antimicrobial substances used on non-living objects outside the body. This substance included antibiotics‚ antifungals‚ antiprotozoals and
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that a person needs to follow when preparing food to prevent food poisoning. Food poisoning has become more popular due to fast food restaurants. It spreads faster because of how common it has become to go out and eat. It is too late to stop the bacteria from spreading after the contaminated food is sent to the restaurants and spread throughout the community (“Food
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