MAT107 Module 5 Assignment 1 LASA 2 Bacterial Growth (Argosy)

As a medical research technician, you have been assigned the task of modeling the growth of five different strains of the E. coli bacteria. These bacteria are grown in Petri dishes and exposed to the same environmental conditions (food source, pressure, temperature, light, etc.). Each hour, you count and record the number of bacterial cultures in each of the sample Petri dishes. The results for the first 7 hours of observations are recorded in the chart below:

Bacterial Sample Hour 1 Hour 2 Hour 3 Hour 4 Hour 5 Hour 6 Hour 7
1 16 64 256 1024 4096 16,384 65,536
2 97 291 873 2619 7857 23,571 70,713
3 112 784 5488 38,416 268,912 1,882,384 13,176,688
4 7 63 567 5103 45,927 413,343 3,720,087
5 143 286 572 1144 2288 4576 9152

Directions: Assuming that the growth pattern for each bacterial sample follows a geometric sequence, determine the following:

  1. Determine the rate at which the culture grows in a hour. This rate will be the factor r by which the number of bacterial cultures has increased since the last recorded observation.
  1. Write a formula that represents the growth of this bacteria based upon your observations. Your formula will be based upon the basic format for a geometric sequence:

  1. Using the formula you’ve developed, determine the number of cultures you would expect to see in the Petri dish on the 8th, 10th, and 12th hour of your observations.
  1. Compute the total number of bacterial cultures observed after 24 hours of growth assuming that the growth follows a geometric series.
  1. Repeat steps 1–4 for all five bacterial samples.


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