Consider the following graph depicting the population growth of bacteria in an "ideal" laboratory created condition. Explain what conditions would allow for a population to grow exponentially like in this example, and why this is unlikely to occur naturally in the wild. Population (number of bacteria) 35000 30000 25000 20000 15000 10000 5000 0 Population Growth of Bacteria in Ideal Conditions Time (hours) 5

Consider the following graph depicting the population growth of bacteria in an "ideal" laboratory created condition. Explain what conditions would allow for a population to grow exponentially like in this example, and why this is unlikely to occur naturally in the wild. Population (number of bacteria) 35000 30000 25000 20000 15000 10000 5000 0 Population Growth of Bacteria in Ideal Conditions Time (hours) 5

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Is the exponential population growth of bacteria modelled best by a logarithmic or an exponential function? Why do you think this model fits so well?
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.
Bacteria grown in a lab experience what is called an 'exponential phase' of population growth. Suppose that, during this phase, a colony of Escherichia coli you are growing has a per capita growth rate, r, of 0.0347 per minute. If the size of your colony at the start of the exponential phase is 0.25 billion cells, then approximately how large will it be in 120 minutes?
For the state science fair, a student investigated the change in a yeast population over five days. The experimental design included the following. • The yeast were grown on a (5%)glucose (sugar) media in a closed, sterile petri dish for five days. • The petri dish was kept at a constant warm temperature (30°C) in an incubator. • The petri dish was observed under a microscope each day during the study, and the number of live cells in the same area of the petri dish was recorded. • Illustrations of observations were made each day of the investigation. Illustrations of Daily Observations of Growing Yeast Colonies :- Day 1 Day 2 Day 3 Day 4 Day 5 18 Cells 58 Cells 111 Cells 69 Cells 35 Cells
You sample cole slaw for bacteria soon after purchase, and after it has been left out on the kitchen counter for 6 hours (room temperature), and after 12 hours (at room temperature). From the data below, CALCULATE the generation time of the bacteria in this sample (at room temperature) – that is, the time it takes for the bacterial population to double in number. Soon after purchase: 4.0 x 103 bacteria per mlAt 6 hours at Room Temperature: 1.9 x 105 bacteria per ml ( = 192 x 103 bacteria per ml)At 12 hours at Room Temperature: 1.2 x 107 bacteria per ml ( = 12,300 x 103 bacteria per ml) What do you calculate the generation time to be? (generation time is the time needed for the population to double in size ) Hint: What is double the initial population? Hint:…
For the bacterial growth curve below in which phase does the number of cell divisions equal the number of cell deaths? Log of number of bacteria 0 Lag Phase Intense activity preparing for population growth, but no increase in population. lag 2019 Pearson Education, Inc. log Log Phase Logarithmic, or exponential, increase in population. stationary Stationary Phase Period of equilibrium; microbial deaths balance production of new cells. The logarithmic growth in the log phase is due to reproduction by binary fission (bacteria) or mitosis (yeast). 5 Time (hr) Death Phase Population is decreasing at a logarithmic rate. death Staphylococcus sp. 10 None of the other four answers are correct Log Phase Stationary Phase Death Phase Lag Phase
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.
Log Nt = Log N0 – t/D. D is the time required for a log kill. A single dose of mouthwash is added to a bacterial culture with 10 million cells/mL and, after 30 minutes, one hundred thousand viable cells/mL remain. How many would survive at the end of 1.5 hours? Based on the equation, can you ever totally decimate the population? In a practical sense, when would you assume that all the cells are dead?
An inoculum of 106 bacterial cells was introduced into a flask of culture medium and growth monitored. No change was seen for 18 minutes (the lag phase), then growth occurred rapidly. After a further 87 minutes, the population had increased to 5.08 × 107 cells. What is the doubling time of the culture? Show your solution. (The 87-minute period is after the lag phase.)
A microbiologist inoculated a flask of nutrient broth with E. coli. The bacterial population entered exponential phase at 11:30 pm and divided every 60 min. At 6:30 am, the culture entered stationary phase with a population of 100,000,000 bacteria mL-¹. At what time was the population 50,000,000 bacteria mL-¹? 5:30 am 12:30 am 4:30 am O Can not be determined from the information given. 3:30 am
A species of bacteria has a doubling time of 24 hours. After incubating the initial population for one week, the final population was 6,400 cells. What was the initial population of that bacteria? Show all work. Equations: Nt = No x 2n Final concentration = (initial concentration)/(total dilution factor) Total dilution factor = (individual dilution factor)# of serial dilutions
In a rapidly changing environment, which bacterial population would likely be more successful: one that has individuals capable of conjugation or one that does not? Explain.