Microbiology Fundamentals: A Clinical Approach
3rd Edition
ISBN: 9781259709227
Author: Marjorie Kelly Cowan Professor, Heidi Smith
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 6, Problem 19Q
In a viable count, each ____ represents a ______ from the sample population.
- a. CFU, colony
- b. colony, CFU
- c. hour, generation
- d. cell, generation
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Select the correct answer from the answers provided. In a viable plate count, each ch represents a a from the sample population. a. cell, colony c. hour, generation b. colony, cell d. cell, generation
Hi, I have the answer for A, but I am not sure for B and C. For:
A, I believe B.
B, I think its low colony forming unit count
C, I am not sure about it.
A culture with approximately 4x105 cells/mL were incubated. After 10 hours, the number of cells had increased to 5x109.
a) How long was the generation time in minutes?b) How many generations have occurred?
Chapter 6 Solutions
Microbiology Fundamentals: A Clinical Approach
Ch. 6.1 - List the essential nutrients of a bacterial cell.Ch. 6.1 - Prob. 2AYPCh. 6.1 - List and define four different terms that describe...Ch. 6.1 - Prob. 4AYPCh. 6.1 - Compare and contrast the processes of diffusion...Ch. 6.1 - Identify the effects of isotonic, hypotonic, and...Ch. 6.1 - Name two types of passive transport and one type...Ch. 6.1 - Prob. 1NPCh. 6.1 - Prob. 2NPCh. 6.1 - Prob. 3NP
Ch. 6.1 - Prob. 1MMCh. 6.2 - List and define five terms used to express the...Ch. 6.2 - Summarize three ways in which microorganisms...Ch. 6.2 - Identify three important environmental factors...Ch. 6.2 - List and describe the five types of associations...Ch. 6.2 - Discuss characteristics of biofilms that...Ch. 6.2 - Which statements are true with respect to...Ch. 6.3 - Summarize the steps of cell division used by most...Ch. 6.3 - Define doubling time, and describe how it leads to...Ch. 6.3 - Compare and contrast the four phases of growth in...Ch. 6.3 - Identify one culture-based and one...Ch. 6.3 - Prob. 2MMCh. 6 - Which descriptors are likely to have applied to...Ch. 6 - Prob. 2QCh. 6 - Speculate about how earths atmosphere came to...Ch. 6 - Which of the following is true of passive...Ch. 6 - Compare the effects of a hypertonic, hypotonic,...Ch. 6 - Usually scientists looking for life on other...Ch. 6 - An organism that can synthesize all its required...Ch. 6 - Provide evidence in support of or refuting this...Ch. 6 - Develop an explanation for why biofilm bacteria...Ch. 6 - Most bacteria increase their numbers by a. sexual...Ch. 6 - Looking at figure 6.3, explain how a cell in a...Ch. 6 - In binary fission, the parent chromosome is...Ch. 6 - A cell exposed to a hypertonic environment will...Ch. 6 - Prob. 14QCh. 6 - Bacteria and archaea are ubiquitous on the planet....Ch. 6 - Prob. 16QCh. 6 - How can you explain the fact that an unopened...Ch. 6 - Prob. 18QCh. 6 - In a viable count, each ____ represents a ______...Ch. 6 - If an egg salad sandwich sitting in a car on a...Ch. 6 - Scientists now believe that most bacteria in...Ch. 6 - Prob. 1VC
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- You inoculated a culture with an initial cell count of 6.5x10^3 cells. The generation time for this organism is 25 minutes. You grew the culture for 10 hours. a) How many generations occurred?b) How many cells will be present after the 10 hours?arrow_forwardIn an experiment to test the effect of temperature on the rate of bacterial reproduction, temperature would be the a. standardized variable. c. dependent variable. b. independent variable. d. control variable.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
- Which of the following is the best definition of generationtime?(a) The length of time it takes for lag phase to occur(b) The length of time it takes a population of cells to double(c) The minimum length of time it takes a cell to divide(d) The length of time a culture stays in stationary phase(e) The length of time it takes log phase to occurarrow_forwardWhy is the top part of a broth or slant culture heated in a flame immediately after removing the cap? a. to kill all the bacteria on the glass b. to sterilize the glass in case you touch it with your loop c. to stimulate the growth of bacteria in the tube d. to create warm air currents that keep other bacteria out e. to expand the glass of the test tube top so that the cap will fit more securelyarrow_forwardA culture starts with 8600 bacteria. After 1 hour the count is 10, 000. A. Find a function the models the number of bacteria after t hours B. Find the number of bacteria after 2 hours. C. After how many hours will the bacteria count double?arrow_forward
- If you start with one bacterium (generation 0), how many bacteria would you have by generation 6 as a result of binary fission? a) 8 b) 16 c) 32 d) 64arrow_forwardThe 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. 580arrow_forwardA pure culture is........... A. A culture of three to four different organisms B. A culture of one organism and another C. A culture if different organisms D. A culture of one organismarrow_forward
- You sliced an apple with a knife that you also used to cut chicken breast into pieces. Your testing afterwards determined that Campylobacter jejuni bacteria were present on the knife at a population density of 1x103/ml. You would expect that this bacterial population would: a. not increase if you stored the apple slices in a jar containing 40% ethanol (ethyl alcohol) b. not increase if you stored the apple slices in a jar containing 5% acetic acid (vinegar) c. make you sick if you ate the apple slices after sitting out at room temperature for 15 hrs d. be killed by properly sterilizing and canning the apple slices e. ferment sugar in the apples into alcohol, producing a “Holiday Bowl” that is 20% ABVarrow_forwardYou tested that a pineapple pie has 4 million of bacteria V in it. The baker did not wash his hands and has probably contaminated the cream initially with 800 cells of bacteria V. He also forgot to refrigerate the pie after baking. A. if the pie was made 5 hours ago, how many generations have occurred (round off final answer to nearest whole number)?B. how long is each generation (use final answer of A for number of generations)?C. using the computed generation time, how many cells of bacteria V would be present 10 hours after the baker has contaminated the pie if it remains unrefrigerated?arrow_forwardThe agricultural practice of spraying crops with pesticides is comparable to the medical practice of administering antibiotics. In which of the following rows are the individual components of this comparison correctly matched? Row Bacterium would correspond to Antibiotic would correspond to Patient would correspond to A. insect pest pesticide crop B. pesticide crop insect pest C. crop insect pest insect pest D. insect pest crop pesticide Group of answer choices A B C Darrow_forward
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