PRESCOTT'S MICROBIO W/PROCTORIO
11th Edition
ISBN: 9781264731060
Author: WILLEY
Publisher: MCG
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Chapter 7.4, Problem 5CC
Suppose the generation time of a bacterium is 90 minutes and the number of cells in a culture is 103 cells at the start of the log phase. How many bacteria will there be after 8 hours of exponential growth?
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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?
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If a single 1.7 × 10−10 m3 bacterium could reproduce through cell division at a rate of 3(t − 0.5t), where t is measured in minutes, how much volume (in m3) will the resulting bacteria colony occupy after 1 hour?
bacteria colony volume = _____ × 104 m3
Chapter 7 Solutions
PRESCOTT'S MICROBIO W/PROCTORIO
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 - MICRO INQUIRY Identify the regions of the growth...Ch. 7.4 - Retrieve, Infer, Apply Define microbial growth.Ch. 7.4 - Retrieve, Infer, Apply Describe the phases of the...Ch. 7.4 - Why would cells that are vigorously growing when...Ch. 7.4 - Calculate the growth rate constant and generation...Ch. 7.4 - Suppose the generation time of a bacterium is 90...Ch. 7.5 - What is the difference between halophilic and...Ch. 7.5 - Why do facultative anaerobes grow best at the...Ch. 7.5 - Retrieve, Infer, Apply 1. How do microorganisms...Ch. 7.5 - Retrieve, Infer, Apply 2. Define water activity...Ch. 7.5 - Prob. 1.3CCCh. 7.5 - Retrieve, Infer, Apply 1. Define pH, acidophile,...Ch. 7.5 - Retrieve, Infer, Apply Classify each of the...Ch. 7.5 - Retrieve, Infer, Apply 3. Describe the mechanisms...Ch. 7.5 - Retrieve, Infer, Apply 1. What are cardinal...Ch. 7.5 - Prob. 3.2CCCh. 7.5 - Prob. 3.3CCCh. 7.5 - Prob. 3.4CCCh. 7.5 - Retrieve, Infer, Apply Describe the five types of...Ch. 7.5 - Retrieve, Infer, Apply What are the toxic effects...Ch. 7.5 - Retrieve, Infer, Apply Where would you expect to...Ch. 7.5 - Retrieve, Infer, Apply List the types of...Ch. 7.5 - Prob. 5.3CCCh. 7.5 - Prob. 5.4CCCh. 7.6 - MICRO INQUIRY What biomolecules make up the...Ch. 7.6 - Prob. 1CCCh. 7.6 - Prob. 2CCCh. 7.6 - Prob. 3CCCh. 7.6 - Retrieve, Infer, Apply What is quorum sensing?...Ch. 7.6 - Retrieve, Infer, Apply How is the communication...Ch. 7.7 - Prob. 1CCCh. 7.7 - What are peptones, yeast extract, beef extract,...Ch. 7.7 - Retrieve, Infer, Apply Describe four ways in which...Ch. 7.7 - What are pure cultures and why are they important?...Ch. 7.7 - Retrieve, Infer, Apply It is known that microbial...Ch. 7.7 - Retrieve, Infer, Apply How might an enrichment...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. 2CCCh. 7.8 - Prob. 3CCCh. 7.8 - For each of the following, which enumeration...Ch. 7.9 - Prob. 1MICh. 7.9 - Prob. 1CCCh. 7.9 - Prob. 2CCCh. 7.9 - Prob. 3CCCh. 7 - Prob. 1RCCh. 7 - Prob. 2RCCh. 7 - Prob. 3RCCh. 7 - Prob. 4RCCh. 7 - Prob. 5RCCh. 7 - Prob. 6RCCh. 7 - As an alternative to diffusible signals, suggest...Ch. 7 - If you wished to obtain a pure culture of bacteria...Ch. 7 - Prob. 3ALCh. 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 - Prob. 7ALCh. 7 - Prob. 8ALCh. 7 - Prob. 9AL
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- What is the generation time (in minutes) of a bacterial population that increases from 10,000 cells to 10,000,000 cells in fours hours of growth? Show computation.arrow_forwardCalculate the generation time in a growth experiment in which a medium was inoculated with 5 X 106 cells/mL of E. coli cells and following a 1 hour lag, grew exponentially for 5 hours, after which the population was 5.4 X 109cells/mLarrow_forwardHow can I solve this equation?arrow_forward
- If the original number of cells in a sample was 12,000, how many bacteria will be present in 12 hours when the generation time is 15 minutes?arrow_forwardSuppose 1,000 bacteria are inoculated into a tube of a minimal salt medium where they double once an hour and 10 cells are inoculated into a rich medium, where they double every 20 minutes. Which tube will have more cells in 2 hours? In 4 hours?arrow_forwardA 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 dilutionsarrow_forward
- A student is performing a bacterial growth curve experiment. At t= 0 hrs, he inoculated 50 mL of the favorable growth medium with 2x 10* bacterial cells. After 6 hrs, the bacterial population was around 450 CFU/50 mL bacteria. Calculate the growth constant "k" for the bacteria.arrow_forwardDraw a graph that shows the potential population growth of a bacterial population that starts with 500 cells. Assume binary fission, a generation time of 30 minutes and reproduction for four (4) generations.arrow_forwardA bacteria having a generation time of 30 minutes will undergo 6 cell division/hr. During 6 hrs of growth, the cells would double 5 times. Beginning with 20 cells/mL at time 0, how many cells would be present at 5 hrs?arrow_forward
- Describe the following phases of the bacterial growth curve and draw them out:a. Lag phaseb. Logarithmic phasec. Stationary phased. Decline/death phasearrow_forwardA bacterial strain is growing exponentially. At 1:00pm the titre of the culture is 2x10^3 cells per ml. Three hours later, the culture is still growing exponentially and the titre is 4x10^4 cells per ml. How many generations have elapsed, what is the generation time, and what will the titre be at 9:00pmarrow_forwardSolve the following problem: 34,000 bacteria/l have been measured 4 hours after inoculating a medium. After 24 hours, the number of bacteria increased to 5.2x10^6/l. Assuming that the lag phase is negligible, calculate: The specific speed of growth. The number of bacteria that were inoculated.arrow_forward
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