Prescott's Microbiology
10th Edition
ISBN: 9781259281594
Author: Joanne Willey, Linda Sherwood Adjunt Professor Lecturer, Christopher J. Woolverton Professor
Publisher: McGraw-Hill Education
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Chapter 7.8, Problem 1MI
Why is it important to have no more than about 250 colonies on the plate when counting colonies to determine
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A culture is inoculated with 109 cells/mL at noon. At ten PM, the population is determined to be 115 cells/mL. What is the number of generations? What is the doubling time?
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:…
Using the attached image and chart, calculate the doubling time for a population with the given growth curve. Coordinates are presented as (time, Ln(population).
Chapter 7 Solutions
Prescott's Microbiology
Ch. 7.1 - MICRO INQUIRY In addition to chromosomes, what...Ch. 7.2 - MICRO INQUIRY Why is it important that the origin...Ch. 7.2 - MICRO INQUIRY What would be the outcome if FtsZ...Ch. 7.2 - MICRO INQUIRY Which step in the development of...Ch. 7.2 - Retrieve, Infer, Apply 1. Describe the three...Ch. 7.2 - Retrieve, Infer, Apply 2. How does the bacterial...Ch. 7.2 - Retrieve, Infer, Apply 3. Do you think MinCDE...Ch. 7.2 - Retrieve, Infer, Apply 4. Do you think Spiroplasma...Ch. 7.3 - What elements of the Sulfolobus spp. cell cycle...Ch. 7.3 - Many archaea have genes encoding an FtsZ...
Ch. 7.4 - What is the difference between halophilic and...Ch. 7.4 - Why do facultative anaerobes grow best at the...Ch. 7.4 - Retrieve, Infer, Apply 1. How do microorganisms...Ch. 7.4 - Retrieve, Infer, Apply 2. Define water activity...Ch. 7.4 - What are halophiles and why do Halobacterium spp....Ch. 7.4 - Retrieve, Infer, Apply 1. Define pH, acidophile,...Ch. 7.4 - Retrieve, Infer, Apply Classify each of the...Ch. 7.4 - Retrieve, Infer, Apply 3. Describe the mechanisms...Ch. 7.4 - Retrieve, Infer, Apply 1. What are cardinal...Ch. 7.4 - Prob. 3.2RIACh. 7.4 - Define psychrophile, psychrotolerant, mesophile,...Ch. 7.4 - Retrieve, Infer, Apply What metabolic and...Ch. 7.4 - Retrieve, Infer, Apply Describe the five types of...Ch. 7.4 - Retrieve, Infer, Apply What are the toxic effects...Ch. 7.4 - Retrieve, Infer, Apply Where would you expect to...Ch. 7.4 - Retrieve, Infer, Apply List the types of...Ch. 7.4 - Prob. 5.3RIACh. 7.4 - Prob. 5.4RIACh. 7.5 - MICRO INQUIRY What biomolecules make up the...Ch. 7.5 - Prob. 1RIACh. 7.5 - Prob. 2RIACh. 7.5 - Retrieve, Infer, Apply What is quorum sensing?...Ch. 7.5 - Retrieve, Infer, Apply How is the communication...Ch. 7.6 - Prob. 1RIACh. 7.6 - What are peptones, yeast extract, beef extract,...Ch. 7.6 - Retrieve, Infer, Apply Describe four ways in which...Ch. 7.6 - What are pure cultures and why are they important?...Ch. 7.6 - Retrieve, Infer, Apply It is known that microbial...Ch. 7.6 - Retrieve, Infer, Apply How might an enrichment...Ch. 7.7 - MICRO INQUIRY Identify the regions of the growth...Ch. 7.7 - Retrieve, Infer, Apply Define microbial growth.Ch. 7.7 - Retrieve, Infer, Apply Describe the phases of the...Ch. 7.7 - Why would cells that are vigorously growing when...Ch. 7.7 - Retrieve, Infer, Apply Contrast and compare the...Ch. 7.7 - Calculate the growth rate constant and generation...Ch. 7.7 - Suppose the generation time of a bacterium is 90...Ch. 7.8 - Why is it important to have no more than about 250...Ch. 7.8 - Briefly describe each technique by which microbial...Ch. 7.8 - Prob. 2RIACh. 7.8 - Prob. 3RIACh. 7.8 - For each of the following, which enumeration...Ch. 7.9 - Prob. 1MICh. 7.9 - Prob. 1RIACh. 7.9 - Prob. 2RIACh. 7.9 - Prob. 3RIACh. 7 - As an alternative to diffusible signals, suggest...Ch. 7 - If you wished to obtain a pure culture of bacteria...Ch. 7 - Design an experiment to determine if a...Ch. 7 - Suggest one specific mechanism underlying the...Ch. 7 - Consider cell-cell communication: bacteria that...Ch. 7 - Suppose you discovered a new bacterial strain from...Ch. 7 - Because many persistent bacterial infections...
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- Which of the organisms in A, B, C, D, E is not of the same species? Discuss how to identify if it is the same species or not.arrow_forwardIf you start out population density of 300 cfu/ml of a bacterium that divides every 20 minutes,what will be the population density after five generations assuming the cells are in the log phase of growth?arrow_forwardWhich of the following statements BEST represents the great plate count anomaly? a The aggregation of the microbial cells causes a problem in the accurate population estimate using plate count. b The colonies growing on a petri plate is not always the organism under the microscope. c The population count using viable cell count is only 1% of the real population. d The number of microbes seen under the microscope is greater that the colonies growing on a petri plate.arrow_forward
- What factors might give rise to variation in the sizes of the colonies?arrow_forwardHow did the author sample ticks at each of the study sites? The author dragged a piece of cloth along a transect every one to two weeks and collected ticks on the cloth. The author sprayed toxins on specified plots of vegetation, and collected all the dead ticks from the ground. The author used pitfall traps to capture ticks crawling along the ground. The author caught a variety of mammal and avian hosts and recovered ticks by dusting animals with a mild pesticide. Article Link https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0201665arrow_forwardIf a population of mold spores tripled in 12 hours, what is the growth rate? If there were 350 mold spores in the origianl sample, how many mold spores would there be after 18 hours?arrow_forward
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