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- C. In 1928, Sir Alexander Fleming was studying Staphylococcus bacteria growing in culture dishes. He noticed that a mold called Penicillium was also growing in some of the dishes. A clear area existed around the mold because all the bacteria that had grown in this area had died. In the culture dishes without the mold, no clear areas were present. Fleming hypothesized that the mold must be producing a chemical that killed the bacteria. He decided to isolate this substance and test it to see if it would kill bacteria. Fleming transferred the mold to a nutrient broth solution. This solution contained all the materials the mold needed to grow. After the mold grew, he removed it from the nutrient broth. Fleming then added the nutrient broth in which the mold had grown to a culture of bacteria. He observed that the bacteria died. 1 2. What was Fleming's hypothesis? Compilation of Biochemistry Laboratory Activities Prepared by FAVillenas and EVSamaniego 3 Identify the problem. 4 5. How was…C. In 1928, Sir Alexander Fleming was studying Staphylococcus bacteria growing in culture dishes. He noticed that a mold called Penicillium was also growing in some of the dishes. A clear area existed around the mold because all the bacteria that had grown in this area had died. In the culture dishes without the mold, no clear areas were present. Fleming hypothesized that the mold must be producing a chemical that killed the bacteria. He decided to isolate this substance and test it to see if it would kill bacteria. Fleming transferred the mold to a nutrient broth solution. This solution contained all the materials the mold needed to grow. After the mold grew, he removed it from the nutrient broth. Fleming then added the nutrient broth in which the mold had grown to a culture of bacteria. He observed that the bacteria died. 1. Identify the problem. 2. What was Fleming's hypothesis? 3. How was the hypothesis tested? 4. Should the hypothesis be supported or rejected based on the…2. Unbeknownst to Surrena, the actual reason for her headache is not the noise generated by her 20 young cousins, but a bacterial infection caused by eating a piece of turkey that had been left out too long. At 4:00pm, the piece of turkey was host to a colony of 20,000 bacteria. By 7:00pm, the colony had grown to 300,000 bacteria. (a) Assuming that the bacteria continued to reproduce at the same relative (percent) rate, how many bacteria were on the piece of turkey when Surrena ate it at 8:45pm? (b) Ingesting just one bacterium usually will not cause an infection but ingesting enough bacteria usually will (if the bacteria can live and reproduce inside of the human body). Biologists often talk about the “infectious dose” (or ID50) of bacteria necessary to cause an infection in 50% of infected hosts. Assuming that the ID50 for this particular strain of bacteria is 100,000 bacteria, when is the latest that Dr. P could have eaten the turkey and had only a 50% chance of getting infected?
- esting 8MU376MpwkNtkrF5%252B26BVPP%252Bzg%253D%2. Question Image 1 3 6. 7. 8. with the figure? cracteristics ight differe dividuals can compared Q. Which of following can you do with the biotechnology depicted in the figure? • 0 1:47 Sign out || O|| | 11ACROSS 4. human habitat characterized by moist, high concentration of nutrients, neutral pH, isotonic 5. a variant of the species (subspecies or breed); aka serotype 7. eight round cells in a cube 8. round shaped bacteria in chains DOWN 1. number of weeks S. aureus can survive on dry surfaces 2. Severity with which a strain may cause disease 3. round shaped bacteria in irregular clusters 6. bacteria that share all major characteristics as determined by DNA sequence 7. human habitat characterized by dry, low nutrient concentration, slightly acidic, hypertonic 9. four round cells in a square Use the clues to fill in the words above. Words can go across or down. Letters are shared when the words intersect. 10 of 10 words placed.25. Why is the phrase, “Follow the science,” imprecise and misleading?(A) Scientists are mostly a bunch of nerds who do not deadlift.(B) Science is a process of falsification, not a set of dogmas.(C) Scientists have historically stated that smoking is good for health, that Thalidomide is safe, and that peptic ulcers are caused by spicy foods (instead of H. pylori).(D) It is neither imprecise nor misleading. Always trust scientists.
- In terms of microbial pathogenicity, molecular Koch's postulates are a set of experimental criteria that show: A microbe is the aetiological agent of a disease A gene encodes a product that contributes to disease A gene encodes a product that contributes to immunity to a disease A mutation does not contribute to disease3c. Describe the evidence suggesting mitochondria are descended from prokaryotic infections of larger cells.Which of these statements is true? An antibiotic is any substance produced by a organism that is antagonistic to the growth of prokaryotes An antibiotic is any substance produced by a prokaryote that is antagonistic to the growth of other viruses An antibiotic is any substance produced by a prokaryote that is antagonistic to the growth of eukaryotic cells An antibiotic is any substance produced by a prokaryote that prevents growth of the same prokaryote.
- Which of the following is NOT true about Koch's postulates? First developed by Robert Koch, the pioneering German microbiologist In the first step, the microbe that causes a naturally occurring disease is cultured from a "wild" (non-laboratory) animal which has that disease None of the other four answers (All are true about Koch's Postulates) They represent a process for showing a causal association between a specific microbe and a disease If the same microbe from a diseased "wild" (non-laboratory) host causes the same disease in a lab animal and it can be cultured from that lab animal, this proves that the microbe is the cause of the naturally occurring disease54. Explain the theory of endosymbiosis. Do you think this theory is plausible? Why?1. In the human body, there are approximately bacterial cells. trillion human cells and trillion TOTAL NUMBER OF CELLS IN THE HUMAN BODY (TRILLIONS) 100 80 Microbial cells that live in and on you 60 40 20 Human cells Figure 13-4 Whet is LieA Guide To Blology, Thid Edition © 2015 W.H. Freeman and Company (Photo: Courtesy of Jay Phelan) а. 90; 10 b. 10; 90 с. 10; 60 d. 60; 10 e. None of the above.
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