You were asked to prepare a dilution series of a bacterial culture where only 3 tubes will be used (all with 5 mL total solution). Draw a schematic diagram to make tube 1 have a 10-2 dilution, tube 2 have 10-3 dilution, and tube 3 to have 10-5 dilution
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- You were asked to prepare a dilution series of a bacterial culture where only 3 tubes will be used (all with 5 mL total solution). Draw a schematic diagram to make tube 1 have a 10-2 dilution, tube 2 have 10-3 dilution, and tube 3 to have 10-5 dilution
- You were instructed to dilute an antibiotic solution 1/10, redilute 1/25, and again 1/50, then you need to make 100mL of each dilution. How would you go about preparing this dilution series? (Present your answer in a schematic diagram)
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- What would the final concentration of a bacteria culture be if 2.7 x 106 cells/ml were diluted 8.2 x 10-2? What would the initial concentration of a bacteria culture be if the final concentration was 3.7 x 102 cells/ml and the total dilution was 4.6 x 10-4?You place 1 ml of a bacterial broth culture into bottle A containing 99 ml of sterile water and mix. You take 1 ml from bottle A and transfer it to bottle B, which contains 99 ml of sterile water. What is the dilution of the bacterial culture in bottle B?How would you produce a 10^-1 dilution if a 3 mL bacterial sample using the entire 3 mL volume? suppose your professor handed you a test tube with 2.0 mL of an E. coli broth culture in it and told you to make a 10^-1 dilution of the entire culture. Explain how you would do this. Show your calculations.
- You prepared 10-7, 10-8, and 10-9 dilutions of a bacterial suspension in sterile saline. Then you plated 0.15mL if each dilution onto each of 3 plates of nutrient agar. After incubation, the colonies were way too numerous to counton the plates prepared from the 10-7 dilution. The plates from the 10-8 dilution had 355, 360, and 350 colonies. The platesfrom the 10-9 dilution had 115, 117, and 118 colonies. Determine the concentration of colony forming units (cfu/mL) inthe original bacterial suspension1 mL of a juice sample is taken and diluted in 9 mL culture medium, subsequently, this suspension is analyzed in the Petroff-Hausser chamber, determines that the total number of bacteria found is 44 bacteria per square, if the chamber has 25 squares, how many bacteria are in the chamber? initial juice sample?Given a log phase bacterial culture with 1 x 10^6 cells per ml and a generation time of 30 minutes how long does it take the culture to reach a density of 6.4 x 10^7 cells per ml?
- Describe how you would make 10 ml of a 1:500 dilution of bacteria by performing TWO SEPARATE DILUTIONS in series? Consider the accuracy of the pipetting so that you don’t make a single dilution that is too large.A 10-5 dilution is performed on a culture of bacteria in order to perform viable plate counts. From the dilution, *0.1 mL* of solution is plated on solid media, and 278 colony forming units grow on the plate. How many bacteria are in a single mL of the original culture? Express your answer to two decimal places using scientific notation. In scientific notation 540 would be written as 5.40*10^2. Since only 0.1 mL is put on the plate, this counts as an extra dilution!!! Any time less than 1 mL is transferred, a dilution is being performed. Any time more than 1 mL is transferred, a concentration is being performed. Include the trailing zero so there are two decimal places Canvas expects a single digit before the decimal point. 5.40*10^2 is how Canvas expects 540 to be formatted in scientific notation 54.00*10^1 would be marked wrong. 0.54*10^3 would be marked wrong. A 10-5 dilution is performed on a culture of bacteria in order to perform viable plate counts. From the…A serial dilution of a bacterial culture yields the following number of colonies. Which plate(s) should be used to determine the original cell density? Plate A Plate B Plate C Plate D Plate E Dilution Factor 10-5 10-6 10-7 10-8 10-9 # of Colonies Too many to count 850 456 80 14 Group of answer choices All of these choices A & B D & E E None of these choices A B & C D B C & D C
- You are asked to make a 1:1000 dilution of a bacterial culture in a final volume of 5000 mL. What should be your initial volume from the original culture? Show solution.If you started with a bacterial concentration of 2,000,000 bacteria/ml and wanted to plate out 40 bacteria what would be the dilution scheme of using 4 dilutionsA student needed to transfer bacteria from a broth culture to an agar plate. Below is the step-by-step what was done to accomplish this. The transfer of bacteria was not successful because of which step? 1. Cap of the broth culture is removed 2. The mouth of the bottle is flamed 3. The loop was flamed 4. The loop was inserted into the culture to pick up the bacteria 5. The loop was flamed 6. The loop containing the bacteria was used to introduced to spread the agar plate 7. The plate was placed in an incubator at 30 Celcius