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- I need help with microbiology What is the magnification of each of the following objectives? scanning: low power: high dry: oil immersion:I need help with microbiology/2010 1. Describe where the following items should be discarded: a) gloves b) petri dishes c) test tubes d) microscope slides 2. Describe the safety procedures for the following hypothetical situations: a. You spilled a full test tube of bacterial culture on the bench top. b. You notice flames coming from the tubing of your Bunsen burnerYou are hired in one of the microbiology labs in Memphis and your first assignment to identify microbial samples from a local restaurant. You are given a set of slides and asked to classify the specimens as Gram positive or Gram negative. 6) What would be the last reagent you use to identify the bacteria? 7) What type of visual aid you need to help you see the bacterial samples clearly? 8) After the use of what reagent, you will be able to decide if you have a Gram positive or Gram negative bacteria? **Please give the answer**
- 1. What is the purpose for using stains? What microbial characteristics can one ascertain from a simple stain? 2. Why is it necessary to make a heat-fix smear and what are the disadvantages of heat fixing? 3. what is the best age for your culture when performing a gram stain? Why? 4. Why is Gean staining considered a differential staining process? 5. What are some reasons a Gram positive cell might appear Gram negative?1.)What is the purpose of a counterstain? 2. What does a mordant do in the Gram stain procedure? Which reagent in the Gram stain is the mordant? 3. True or False? The oil objective should make contact with the oil on the slide. 4. Why is it necessary to let bacterial smears completely air dry before heat fixing? 5.Why should controls be included wherever possible for any staining technique? 6. Why is it necessary to heat the slides while staining for endospores?You are hired in one of the microbiology labs in Memphis and your first assignment to identify microbial samples from a local restaurant. You are given a set of slides and asked to classify the specimens as Gram positive or Gram negative. 9) What makes the bacteria Gram negative?10) Approximately how long would it take you to finish the entire procedure
- (a) Which would be easier to prepare bacterial smear from, liquid or solid culture? Why? (b) Aside from bacteria, can gram staining be used with microbes such as fungi? Explain your answer.2. You use tubes to test aerotolerance of bacteria. From your samples you have 3 results: A. Bacteria growing on the surface. B. Bacteria growing throughout the tube, the agar shows cracks. C. Bacteria growing about 5 mm below the surface. Please interpret each bacterial result. (Give the bacteria an oxygen classification, explain what classification means and interpret the cracks in the agar.)1. What is one advantage of utilizing the pour plate technique over the streak plate technique ? 2. Why must the agar pours be cooled to 45C before use in the pour plate technique? 3. Explain the consequences if a group removed all the agar pours from the water bath at one time and allowed them to sit on the bench for several minutes before using them. 4. Why can the agar pour tubes be rinsed in the sink after the agar is transferred to the Petri plate ? Could you rinse the tubes if the bacteria had been pipetted into the agar pour tubes rather than in the plates? Explain. 5. What would be the result if a student dipped his / her loop in the stock culture during inoculations of each quadrant ? Explain . part B 1. The introduction stated that microbes are mechanically separated or diluted over the surface of the medium . How is this accomplished ? 2. Go to https://commons.wikimedia.org/wiki/File:MacConkey_agar_with_LF_and_LF_colonies . . Which side of the plate (left or right)…
- Choose two from the following culture preservations that are best to use when only an ordinary refrigerator is available for storage: a) Drying b) Mineral oil overlay c) Freezing with liquid nitrogen d) Lyophilization e) Periodic transfer to fresh mediumThe Petri Dish method is used in microbiology to raise bacteria in: a) rapid growth b) pure culture c) septic environment d) all of the above 2. What is the difference between antiseptic and sanitization?3. In order to prevent any kind of contamination the medium must be _________ before placing it in the Petri dish. a) lyophilized b) pasteurized c) autoclaved d) distilleTell me three things about how cultures are handled in a clinical laboratory.