In a batch reactor with an optimal culture medium, which of the following growth-phase sequences is most likely to happen to freshly inoculated bacteria? O Exponential growth phase -> Stationary phase -> Lag phase -> Decay phase O Lag phase -> Stationary phase -> Exponential growth phase -> Decay phase O Lag phase -> Exponential growth phase -> Stationary phase -> Decay phase Stationary phase -> Lag phase -> Exponential growth phase -> Decay phase
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- Suppose that you were tasked with 4 cultures of a specific Bacteria Species in Luria Broth medium: (1) culture A – cells are in lag phase; (2) culture B – cell in log phase; (3) culture C – cells in stationary phase; and culture D – cells in decline phase. Imagine that you observe the growth rates of each culture in a fresh sterilized LB medium. Now, plot the outcome growth curves of cultures A, B, C and D in a single graph.A bacterial strain has a generation time of 30 min, how long would it take an exponentially growing culture to increase from a titre of 5 x 103 cells per ml to 4 x 109 cells per ml? How many generations would have elapsed? Show all of your calculations. G = t/n to calculate generation time (i.e. for population to double) During the growth of the culture, periodic observations of the cells under the microscope have revealed the occurrence of typical rod-shaped cells. However, after further incubation, they appeared to change their morphology to form small oval or spherical-shaped structures. What do these structures likely represent? And what are the likely factors contributing to this observation? Explain what growth phase this culture will be in.Use the following passage to answer 2 consecutive questions. A urine specimen was collected in a container and placed on the central desk for delivery at 10:00 am. The specimen is not sent to the lab until 5 hours later (3:00 pm). The sample time was marked by the central clerk as collected at 4:00 pm. The bacterial species has a generation time of 30 minutes at room temperature. There are 100 bacterial cells/ml at the time of collection (10:00 am). The laboratory will cite a bacterial infection at more than 1000 bacterial cells/ml.
- What are the defining characteristics of the exponential/log phase of the bacterial growth curve. Explain the culture conditions that arise that cause the phase to end. In different culture media, and the exact same starting inoculum, will the end of exponential/log occur at the same time? Why or why not? A graph or a drawing of the growth curve would help but is not essential to answer this question.Bacteria can increase in their number by binary fission into two daughter cells. The rate of exponential growth of a bacterial culture is expressed as generation time, how can the growth curve effect on generation time bacterial؟In growing E.coli, why is that (reasons) they do not grow after doubling time under 20 degrees celsius and under 37 degrees celsius, the number of colonies after doubling time has decreased?
- 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 CThe wild type bacterium is lac+ amps, leu+, ade+ Mutant I is: lac+ amp r, leu-, ade+ Mutant 2 is: lac+, amp s, leu+, ade- Mutant 3 is: lac-, amp r. leu-, ade- The circles below represent six different types of growth medium for these cells. The text below each circle indicates the composition of the medium in that plate. Please divide each plate into quadrants, one for the wild type and one each for the three mutants. Then, draw in the appearance of the plates after we place cells of these genotypes on them and allow growth to occur (if it can). rich, glucose rich, lactose OO minimal, leucine, adenine minimal, glucose, adenine rich, lactose, amp O minimal. glucose, leucineIn August 2021, there was a multi-state outbreak of melioidosis, an infectious disease caused by the bacterium Burkholderia pseudomallei, thought to arise from imported products. Burkholderia pseudomallei can be grown in culture. In terms of human health, why might it be critical to grow a pure culture of bacteria?
- After inoculating and incubating an agar slant from a pure broth culture of a bacterial species such as E. coli, which of the following would indicate an unsuccessful aseptic transfer? (Choose ALL that apply) a - There is fungal growth in the original broth culture tube. b- There is too much growth on the agar slant. c- There are colonies of similar morphology on the slant. d - There are red, yellow, and white colonies on the slant. e - There is no growth on the slant.A phenylgalactoside-type compound, which yields galactose when enzymatically cleaved, was added as the sole carbon source to petri dishes containing E. coli culture medium. E. coli can utilize galactose for growth. Each of the following bacterial strains was plated on this medium and scored for growth after 1-2 days. Growth Genotype lacz+ lacI+ lacz+ lacIs lacz+ lacl- + oc lacZ+ lacI+ + a) What do you conclude about this compound with respect to its ability to be cleaved by ß- galactosidase? Why? b) What do you conclude about this compound with respect to its ability to inactivate the Lac repressor? Why? TIn the Messelsohn-Stahl experiment, there should be ______ band(s) in the centrifugation tube after two generations of bacterial growth in normal nitrogen. Group of answer choices None of these One light and one medium density Two light and heavy Three light bands One heavy