c------------------------------------------------- Evidence for Endosymbiotic theory: ------------------------------------------------- Evidence that mitochondria and plastids arose from bacteria is as follows:[13][14][15] * New mitochondria and plastids are formed only through a process similar to binary fission. * In some algae‚ such as Euglena‚ the plastids can be destroyed by certain chemicals or prolonged absence of light without otherwise affecting the cell. In such a case‚ the
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Regarding the cell walls of bacteria‚ a Gram stain determines what kind of bacterium the cell is. The Gram stain works by creating a purple dye that either attaches or fails to attach to the peptidoglycan either found or not found on the cell wall of the cell. Gram-positive bacteria are cells that have a large amount of peptidoglycan in their cell wall‚ and those that are Gram-negative have an extra cell
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Introduction: Bacteria are microscopic‚ single-celled organisms. Their genetic information is encoded in one large chromosome. It can also be found in plasmids which are small circular pieces of DNA that contain important genetic information for the growth of bacteria. In nature‚ this information is often a gene that encodes a protein that will make the bacteria resistant to an antibiotic. The reason for this protein being made within the bacteria is because of how bacteria usually grow in the same
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Water Microbiology INTRODUCTION There are 4 learning goals for this lab: 1. Collect samples and compile data from at least 2 sources (soil; water) of your choice. 2. Identify at least 2 Prokaryotes (bacteria) and 2 Eukaryotes (fungus) in your samples. 3. Research the importance of bacteria and fungus to Earth in a non-medical context. 4. Compile a high-quality‚ 3+ resource (excluding the lab worksheet)‚ MLA-cited in-text laboratory report using the scientific method by class due date. HYPOTHESIS
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four time‚ propose is to isolate the unknown bacteria. Therefore‚ the first time to streak on the plate‚ there are million of bacteria on the loop. For that reason‚ we need to sterilize the loop before next streaking. Then we can get small group of colonies out from the large group of colonies to observe and distinguish the unknown bacteria. 2. Define pure culture‚ a mixed culture? Ans: Pure culture is mean that only contain single species bacteria in the culture. If we plate out it onto the
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Hand Soap Effectiveness on Escherichia Coli Abstract: Bacteria are an essential part of many different living organisms and ecosystems across the globe. Without bacteria there would have never had been life in the first place. But some bacteria have evolved to cause to humans‚ resulting in the need to eliminate them through such methods as soap. Hand soap is a crucial part of human health‚ especially in such places as schools and hospitals. In this experiment I wanted to determine the effectiveness
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Eyes How do bacteria cause disease? • Bacteria cause disease by producing harmful chemicals‚ which are toxins of enzymes. These toxins kill or damage body cells. The damage to the body cells causes the symptoms of the disease. How does the structure of bacterial cells differ from that of human cells? • Bacterial cells have a slightly different structure than that of human cells. These structural differences are important because they allow antibiotics to kill bacteria without killing
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altered bowel movement following an increased water content‚ volume and/or frequency of stools. Infectious diarrhoea is usually linked to vomiting‚ nausea or abdominal cramps. When foreign bacteria‚ viruses or parasites enter the body‚ they cause infectious diarrhoea. Bacterial infections are caused by consuming bacteria‚ such as‚ Shigella‚ Salmonella‚ Escheria coli (E.coli) and Camylobacter via contaminated food or water. Many viruses such as rotavirus‚ norovirus and viral hepatitis can cause diarrhoea
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DEBATE: New Strains of Drug-Resistant Bacteria In 1969 when Dr. William H. Stewart claimed that the war against pestilence was won‚ he had no idea how wrong his statement was. Were he able to see what the future of antibiotics held‚ he would never have said‚ “It is time to close the book on infectious diseases‚ and declare the war against pestilence won”. He was completely oblivious to important aspects of antibiotics including their ineffectiveness on viruses and the potential harm that
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that it will distort the bacterial cells; then pick up a pinhead size sample of the bacterial growth without digging into the agar. COMPLEX STAINING Reflame the tube mouth‚ replace the can‚ and put the tube back in the holder. 10. Disperse the bacteria on the loop in the drop of water on the slide and spread the drop over an area the size of a dime. It should be a thin‚ even smear.
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