In which phase would you expect to find the most endospores in a bacillus cell culture? pick one options: Lag Phase All 3 Phases Death Phase Log Phase
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In which phase would you expect to find the most endospores in a bacillus cell culture?
pick one options:
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All 3 Phases |
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Death Phase |
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Log Phase |
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- When microbiologists are working with bacterial batch cultures, we would expect to see no net change in bacterial numbers in ________________ , as this is the stage where the cells of the inoculum are adjusting to their new environment (i.e., the fresh culture medium) and preparing for cell division. stationary phase death phase lag phase log/exponential phaseDraw the following growth curves for E. coli, starting with 100 cells with a generation time of 30 minutes at 35°C 60 minutes at 20°C, and 3 hours at 5°C. The cells are incubated for 5 hours at 35°CDescribe the following phases of the bacterial growth curve and draw them out:a. Lag phaseb. Logarithmic phasec. Stationary phased. Decline/death phase
- Assume an inoculum with a cell density of 108 cells per mL. The entire generation time takes 30 minutes. How many hours would it take to grow a culture to 108/mL if you started with a 10–2 dilution? helpful formula: g (generation time) = 0.301 (time)/ log x – log xoA 23 year old woman has 10 E coli in her bladder. The organism has generation time of 20 minutes. After a lag of 20 minutes, the E. coli entered the log phase of growth. After 3 hours, what is the total number of cells?Starting with 10 bacterial cells per milliliter in a sufficient amount of complete culture medium with a 1-hour lag phase and a 30-minute generation time, how many cells will there be in a liter of medium at the end of 2 hours? At the end of 7 hours? Show your solution.
- In stages of bacterial growth, this is the phase where the bacterium adjusts to the new environment and the start of biosynthesis although increase in cell mass is not evident. Question options: Period of Rejuvenescence Log Phase Plateau Phase Exponential PhaseMicrobiologists use the Gram stain to differentiate among two groups of bacteria. How do Gram-positive and Gram-negative bacteria differ? Question 1 options: the presence or absence of peptidoglycan in the cell wall the presence or absence of muramic acid in the cell wall the presence or absence of outer plasma membrane the lipid composition of plasma membrane none of the above.What type of microbes are often withstand and survive high pressure treatment? Group of answer choices virus particles halophiles endospores mesophiles fungal hyphae
- How long does it take for E. coli to go from lag phase at time 0 to log phase to stationary phase to death phase? Can you point me to a citable source of this time period? I can't find anything online. Thank you.The bacterium Dontuplodemeus tocheggus has a generation time of 20 minutes. Starting with one cell in 500 mL of culture medium, how many minutes would it take to reach a cell density of approximately one million cells per mL? Assume all cells remain viable. a. 330 b. 660 c. 380 d. 400 e. 580A microbiologist is working with a pure strain of bacteria isolated from a mixed sample. Which of the following would indicate that the bacterium is NOT Streptococcus mutans? Cells are arranged in chains. Secretes acids produced from metabolism of sucrose. Cells are cocci. Can grow in biofilms. Cells stain Gram negative.