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Microbiology: Principles and Explorations
9th Edition
ISBN: 9781118743164
Author: Jacquelyn G. Black, Laura J. Black
Publisher: WILEY
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Textbook Question
Chapter 6, Problem 20SQ
During quorum sensing, bacteria sense their population density by;
- (a) Secretion of inducer molecules that become effective when a sufficient amount is secreted
- (b) Detection of compression from neighboring cells
- (c) Detection of nutrient depletion
- (d) Mobilization of sentry cells that circle the periphery of the colony
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Students have asked these similar questions
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 occur
Which of the following statements is TRUE?
Log cell numbers
1
Time
a) The generation time for bacteria is usually the same from species to species.
b) In the lag phase, cell death exceeds cell division.
c) Bacteria typically divide by budding, producing a daughter cell that is smaller
than the parental cell.
d) In the death phase, bacterial growth stops because of nutrient depletion and
waste accumulation.
Identify which of the following statements is a lie?
Select one:
a. Bacterial biofilms due to quorum sensing can be found on medical equipment and implants such as hip or knee replacements or heart pacemakers.
b. Quorum sensing uses autoinducers as signaling molecules. Autoinducers are signaling molecules secreted by bacteria to communicate only with the same species of bacteria.
c. The first evidence of bacterial communication was observed in a bacterium that has a symbiotic relationship with Hawaiian bobtail squid.
Chapter 6 Solutions
Microbiology: Principles and Explorations
Ch. 6 - What are the differences between the lag phase and...Ch. 6 - How does logarithmic rate of increase differ from...Ch. 6 - Prob. 1.3SCCh. 6 - Why does a direct microscopic count of bacteria...Ch. 6 - What does the ending -phile mean? Distinguish...Ch. 6 - What enzymes do most obligate anaerobes lack? How...Ch. 6 - Prob. 2.3SCCh. 6 - Prob. 3.1SCCh. 6 - Distinguish between the various kinds of media:...Ch. 6 - What is the purpose of a stock culture? Why is it...
Ch. 6 - Prob. 1CCSCh. 6 - Exactly 100 bacteria with a generation time of 30...Ch. 6 - In the above example, do you think that the number...Ch. 6 - Prob. 3CTQCh. 6 - Prob. 1SQCh. 6 - Match the following growth phase terms to their...Ch. 6 - Which of the following is the best definition of...Ch. 6 - Prob. 4SQCh. 6 - The most probable number (MPN) technique is a...Ch. 6 - Match the terms with their definitions:Ch. 6 - Prob. 7SQCh. 6 - Why do foods containing a high concentration of...Ch. 6 - Some bacteria have complex nutritional...Ch. 6 - Prob. 10SQCh. 6 - Which type of cell will shift to aerobic...Ch. 6 - Which of the following statements about endospores...Ch. 6 - Prob. 13SQCh. 6 - Blood agar is often used to observe changes in the...Ch. 6 - A bacterial medium that contains 20 grams of beef...Ch. 6 - MacConkey agar contains the dye, crystal violet,...Ch. 6 - Prob. 17SQCh. 6 - What are the purposes of carrying out the streak...Ch. 6 - Prob. 19SQCh. 6 - During quorum sensing, bacteria sense their...Ch. 6 - Prob. 21SQCh. 6 - Identify the position of each of the following on...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- In a certain culture of bacteria, the rate of increase is proportional to the number present. (a) if it is found that the number doubles in 6 hours, how many may be expected at the end of 18 hours? (b) If there are 10^2 at the end of 4 hours and 8(10^2) at the end of 8 hours, how many were at the beginning?arrow_forwardQuorum sensing is one of the coolest things we've learned about this semester, because it is one way that bacterial cells can actually communicate with each other. Which are true about Quorum Sensing? (Choose all that apply.) Group of answer choices Quorum sensing depends on the sensing of signal protein molecules. Quorum sensing is a synonym for biofilms. Quorum sensing allows bacteria to monitor their own population density. Quorum sensing is present almost exclusively in non-pathogenic bacteria and does not contribute to virulence.arrow_forwardWhich of the following would occur if a motile bacterium were moving towards an attractant? A) Oa lower frequency of clockwise rotation of flagella B) Oa greater frequency of counterclockwise rotation of flagella C) Oa decrease in the frequency of tumbles D) OA, B, and C are correct E) OA and B are correct F) OB and C are correctarrow_forward
- Why might bacteria use quorum sensing to regulate genes needed for virulence? How might this reason be related to the rationale behind using quorum sensing to establish a symbiotic relationship?arrow_forwardDuring which growth phase are bacteria experiencing conditions in which microbial waste products are building up and nutrients are running low, resulting in a death rates outpacing reproduction? O 1) death phase O 2) stationary phase O 3) lag phase O 4) log phase O 5) VNCarrow_forwardWhich of the following scenarios describes the process of osmosis? a) An amoeba engulfs a food particle. b) Sodium ions flow through the cell membrane. c) A carrier protein moves glucose into the cell.. d) A plant cell swells in a hypotonic environment.arrow_forward
- Based on the diagram below, which of the following statements is TRUE? D E A outside cell inside cell B ATP ADP+ Pi 1) F requires ATP directly 2) B is an example of symport 3) B is gradient driven 4) B is an example of antiport 5) None of the above are true C G F iiii L H (CO Narrow_forwardWhich statement among A - D is false? A) O Active transport processes allow a bacterium to maintain an ion gradient B) O Membrane permeant acids and bases can act as growth inhibitory agents towards bacteria. C) O Transport via group translocation results in modification of the incoming solute. D) O Bacteria tend to maintain their interior slightly hypertonic relative to the external environment. E) O None of A-D is false.arrow_forwardTwo-component system (TCS) allows an organism in adapting to changes in the environment. It is available mostly in prokaryotes but is also available to some eukaryotes. a) Justify the importance of TCS.arrow_forward
- In the experiment by Bernard Davis, bacterial F+cells and F- cells were growing while separated by a filter. Filter pores allowed the passage of the liquid medium but not the bacteria cells. As a result: 1) prototype colonies grew well on minimal medium 2) F+ cells were converted to F- cells despite the physical separation 3)F- cells were converted F+ cells despite the physical separation 4)F+ cells were not converted to F- cells because of the physical separation 5) F- cells were not converted to F+ cells because of the physical separation 6)there was no growth of prototypes on minimal mediumarrow_forwardThe time interval required for the formation of two cells from one is called the A) generation time. B) growth time. C) growth rate. D) division rate.arrow_forwardBacterial growth depends on many environmental factors, including the temperature of the environment. Since microbes can survive in a certain range of temperatures and will thrive at a temperature, understanding these variables allows for control of their growth. This understanding can be used, for example, to preserve certain foods or to treat infections. This lab simulation will use an instrument called a spectrophotometer. This instrument quantitatively measures the amount of light that is absorbed or transmitted by molecules in solution a) In your own words give an introduction to the microbial growth and the effect tempature has. b) In your own words explain the importance of the spectrophotometer in regards to microbial growth. c) In your own words give a hypothesis on how bacteria will react to different temperatures.arrow_forward
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Prokaryotic vs. Eukaryotic Cells (Updated); Author: Amoeba Sisters;https://www.youtube.com/watch?v=Pxujitlv8wc;License: Standard youtube license