Match the following growth phase terms to their definitions: Select the INCORRECT match. a. Stationaryphase/ The number of new cells produced equals number of cells dying b. Death phase/ Cells lose their ability to divide and die c. Lag phase/ Organisms are metabolically active but not increasing in cell number d. Log phase/ Organisms divide at an exponential rate with constant generation time e. Chemostat/ Continuous addition of fresh medium, which allows cultures to be maintained

Match the following growth phase terms to their definitions: Select the INCORRECT match. a. Stationaryphase/ The number of new cells produced equals number of cells dying b. Death phase/ Cells lose their ability to divide and die c. Lag phase/ Organisms are metabolically active but not increasing in cell number d. Log phase/ Organisms divide at an exponential rate with constant generation time e. Chemostat/ Continuous addition of fresh medium, which allows cultures to be maintained

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter26: Prokaryotes: Bacteria And Archaea

Section: Chapter Questions

Problem 2ITD: The proteobacteria in the genus Pseudomonas are important spoilers of food. The rate at which food...

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Which of the following is the best definition of generationtime?(a) The length of time it takes for lag phase to occur(b) The length of time it takes a population of cells to double(c) The minimum length of time it takes a cell to divide(d) The length of time a culture stays in stationary phase(e) The length of time it takes log phase to occur
Select the correct answer from the answers provided. The time required for a cell to undergo binary fi ssion is called the a. exponential growth rate c. generation time b. growth curve d. lag period
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.
The graph shows the number of microbial cells (log scale) against time in a liquid culture. In which stage(s) are the cells growing and dividing? A, B, and C B and C A B
Based on the growth curve, which ONE of the following best describes what would happen if sample of culture in the presence of drug B is inoculated onto drug-free growth medium? Select one: A. Growth present, but cell count increased by at least 99.9% of the original culture B. No growth after 24 hrs C. Growth at 24 hrs D. Not possible to predict because the culture could either be alive or dead E. Growth present, but cell count reduced by at least 99.9% of the original culture
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. 580
According to the Liebig's Law of Minimum, which condition of certain growth factor limits growth of microorganisms? * A. factor in abundance B. factor in optimal C. factor in minimum D. factor in maximum 2. Growth is best when microbes are incubated at ______ level within its tolerance range. * A. minimum B. maximum C. optimum D. magnanimous 3. At what phase of microbial growth when microbial growth and reproduction is fastest? * A. death phase B. log phase C. lag phase D. stationary phase 4. Most human pathogens are ______ with regard to temperature range of tolerance for optimum growth. * A. thermophiles B. mesophiles C. psychrophiles D. xerophiles 5. Which adaptations are developed by thermophiles to withstand extremely high temperature? Check all that apply. * ( ) high proportion of unsaturated fatty acids in the cell membrane ( ) high cytosine-guanine nitrogenous bases ( ) more saturated fatty acids in cytoplasmic membrane ( ) heat-stable enzymes
The time required for a cell to undergo binary fission is called thea. exponential growth rate b. growth curve c. generation time d. lag period
Disinfectants, be they heat or radiation or chemicals, usually kill a constant proportion of the cells present per unit time if the cells are all equally susceptible. Hence, the term ‘log kill.’ The probability of death is constant over time given a ‘single hit.’ The more cells present at the start, the greater the number killed per unit time and the longer it will take to kill them ‘all.’ One decimal reduction is one log place (exponent). Log Nt = Log N0 – t/D. D is the time required for a log kill. A suspension of 105 CFU/mL of Salmonella is treated with bleach, and 90% of the cells are dead after 10 minutes. How many viable cells per mL would you expect after 30 minutes? Yes, the 30 minutes here implies 3 logs of killing. This is an excellent problem to use with the Death Equation because you can reason it through first, and then solve it using the equation.
You are a technician working in a microbiology lab. You grow two bacteria cultures, Bug A and Bug B, for two purposes: You want to harvest lactic acid for sports drinks from Bug A. You want to harvest antibiotics from Bug B for the pharmaceutical industry. Describe how you would maintain the two cultures, how you might manage their nutrient supply and waste products in order to induce them to produce the desired products. Which stage of the growth curve would you try to keep them in?
Examine the following graph. Note that the growth rate increases slowly until the optimum is reached, andthen it declines steeply over higher temperatures. In other words, organisms tolerate a wider range oftemperatures below their optimal temperature than they do above the optimum. Explain this observation please explain the observation
A bacterial culture contains 500 organisms / mL in the exponential growth phase at 8 am in the morning. If you consider a generation time of 20 minutes, the total number of organisms / mL (round off to the nearest integer) after three hours (i.e. at 11 am in the morning) will be