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- 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 sample of raw ground beef initially contained 25 E. Coli bacteria. After six hours, there are 102 400 cells in the sample. What is the growth rate of the E. coli population? Show all work. Express your answer using scientific notation in the form of xyz 10 d #bacteria/hr.Which of the following affects the elimination of bacteriafrom an object?(a) Number of bacteria present(b) Temperature(c) pH(d) Presence of organic matter(e) All of the above
- The number of bacteria in culture increases rapidly. The table below gives the number of bacteria a few times (in hours) after the moment when. (a) Find the average rate of change for the number of bacteria from 0 hours to 3.1 hours. (b) Find the average rate of change for the number of bacteria from 6.2 hours to 15.5 hours.Which of the following is not one of the six major elements microbes need tosurvive, grow, and reproduce?a. oxygenb. calciumc. sulfurd. nitrogene. carbonWhich of the following prevented an aerotolerant anaerobic, mesophilic and halophilic bacterium from contaminating your home aquarium? the water was at 37ºC you placed a high amount of glucose into the aquarium you placed several pennies in the aquarium you were using a .45 um filtering unit you placed carbon dioxide instead of oxygen into the aquarium
- 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 beIn an experiment to calculate the decimal reduction time for an Escherichia coli culture, viable cells were exposed to a constant temperature of 80°C for a set amount of time. After exposure, the remaining number of surviving cells were counted. Based on Table 1, what is the decimal reduction time?Table 1. Decimal Reduction Time for E. coli Heated to 80°C Total time of exposure (minutes): Number of Microbial Cells Present: 0 100 1 80 3 50 4 42 6.5 26 13 10 21 0the scientist is studying the effect of water purification tablets on the creek water in her local area. She collected several different 2 L samples from a creek. For each sample, she measured the number of coliform group bacteria colonies in the water initially, and then added a water purification tablet and measured the number of coliform group bacteria colonies over time. She found that the following equation was a good fit to the data: C(t) = 80e−0.05t + 8(t + 1)−0.5.Her model says that C(t) is the number of coliform group bacteria colonies at time t, where t is measured in minutes since the tablet was added to the water. (a) According to this model, how many coliform group bacteria colonies would initially be in a 2 L sample of the water? background information: The quality of drinking water is determined by tests for coliform group bacteria, which are organisms found in soil and in the intestinal tract of warm-blooded animals. Coliform group bacteria are not considered to…
- A bacteria cell which is longer than it is wide is classified as: Vibrio Coccus Bacillus Bacteria which normal colonize the human gut are classified as: Anaerobes Pathogens Aerobes A bacteria which absolutely needs oxygen to live is classified as: Obligate anaerobe Obligate aerobe Facultative anaerobe The structure on this list which will NOT be found in any bacterial cell is: Cytoplasm Flagella Nucleus The genetic information of bacteria cell is contained in the: Capsid Nucleoid Ribosomes The genetic material of a virion is called the: Genome Nucleoid NucleusYou obtain a 1 mL sample of contaminated drinking water in order to calculate the number of fecal bacteria in the water. The 1 mL sample is diluted into a first bottle with 99 mL of sterile saline. One mL from the first bottle is transferred into a second bottle of saline containing 9 mL. Finally, 1 mL from the second bottle is transferred to a third bottle with 9 mL of saline. You create two spread plates from the third bottle: plating 0.1 mL results in 106 colonies, while plating 1 mL results in 562 colonies. How many fecal bacteria per mL are in the drinking water? This is a homework assignment, and I am struggling to do this correctly. Thanks for your help.If it takes 2 hours for a population of bacteria to grow from 100 cells to 1600 cells, what is the generation time of this bacterial species? 15 minutes 20 minutes 30 minutes 40 minutes