Microbiology: A Systems Approach
4th Edition
ISBN: 9780073402437
Author: Marjorie Kelly Cowan Professor
Publisher: McGraw-Hill Education
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Chapter 4, Problem 3CTQ
Quorum sensing is a process used by many bacteria for communication. It involves the production of molecules called autoinducers, which act as bacterial chemoattractants. Describe how a motile bacterium would use its flagellum to respond to such a stimulus in its environment.
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Bacterial 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
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Answer as…
Gram-negative bacteria are surrounded by two membrane bilayers separated by a space termed the periplasm. The periplasm is a multipurpose compartment separate from the cytoplasm. The periplasm has a distinct oxidizing environment that allow certain key protein structural features to be formed. Can you identify an amino acid(s) that would be affected by this oxidizing environment? How would it be affected, and what structural features would be sensitive to this environment? Can you discuss the implications of this from a standpoint of recombinant protein expression?
Chapter 4 Solutions
Microbiology: A Systems Approach
Ch. 4.1 - List the structures all bacteria possess.Ch. 4.1 - Identify at least four structures that some, but...Ch. 4.1 - Prob. 3AYPCh. 4.1 - Prob. 4AYPCh. 4.1 - Provide at least four terms to describe bacterial...Ch. 4.2 - Describe the structure and function of five...Ch. 4.2 - Prob. 7AYPCh. 4.3 - Prob. 2CFCh. 4.3 - Prob. 8AYPCh. 4.3 - Prob. 9AYP
Ch. 4.3 - Prob. 10AYPCh. 4.4 - Prob. 11AYPCh. 4.4 - Prob. 12AYPCh. 4.5 - List some differences between archaea and...Ch. 4.6 - Differentiate between Bergeys Manual of Systematic...Ch. 4.6 - Prob. 15AYPCh. 4.6 - Define a species in terms of bacteria.Ch. 4.6 - Prob. 2CFCh. 4 - Prob. 1CFCh. 4 - Which of the following is not found in all...Ch. 4 - Pili are tubular shafts in ____ bacteria that...Ch. 4 - Prob. 3MCQCh. 4 - Which of the following is a primary bacterial cell...Ch. 4 - Which of the following is present in both...Ch. 4 - Darkly stained granules are concentrated crystals...Ch. 4 - Bacterial endospores usually function in a....Ch. 4 - A bacterial arrangement in packets of eight cells...Ch. 4 - Prob. 9MCQCh. 4 - Prob. 10MCQCh. 4 - Prob. 11TFCh. 4 - A research microbiologist looking at evolutionary...Ch. 4 - Nanobes may or may not actually be bacteria.Ch. 4 - Both bacteria and archaea used to be known as...Ch. 4 - Prob. 15TFCh. 4 - Define the term ubiquitous and explain whether...Ch. 4 - Prob. 2CTQCh. 4 - Quorum sensing is a process used by many bacteria...Ch. 4 - Prob. 4CTQCh. 4 - Prob. 5CTQCh. 4 - Based upon your knowledge of cell wall structure,...Ch. 4 - Provide evidence in support of or refuting the...Ch. 4 - a.Describe the characteristics of an...Ch. 4 - Prob. 9CTQCh. 4 - Prob. 10CTQCh. 4 - Prob. 1CCCh. 4 - Prob. 2CCCh. 4 - Prob. 1VCCh. 4 - From chapter 1, figure 1.14. Study this figure....Ch. 4 - Prob. 1CM
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- 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_forwardProkaryotes can move in response to many stimuli in their external environment. The response of a bacterial cell to chemical cues is best defined as . Group of answer choices Chemotaxis Gravitaxis Phototaxis Magnetotaxisarrow_forwardDiseases that involve biofilm-producing bacteria are of serious concern. They are not as easily treated compared with those involving free-floating (or planktonic) bacteria. Explain three reasons why biofilm formers are more pathogenic. Brian goes to the hospital after not feeling well for a week. He has a fever of 38 °C (100.4 °F) and complains of nausea and a constant migraine. Distinguish between the signs and symptoms of disease in Brian’s case.arrow_forward
- Bacterial 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. Microbial populations grow at different rates based on temperature. One way to measure growth is by turbidity measurements. When bacteria multiply in a broth culture they turn the clear solution cloudy, or turbid. a) in your own words explain the proper steps to Inoculate 5°C sterile broth tube using aseptic techniquearrow_forwardYou have a mixed culture of 2 different bacterial species. One of the species is Gram negative bacilli and the other species is Gram positive cocci. You have noticed that one species is killed by penicillin antibiotics (attacks peptidoglycan) while the other survives. Neither species has antibiotic resistance genes. How can you explain this result? Remember to make direct reference to each bacterial species in your responsearrow_forwardBacterial cells communicate with each other via Question 2 options: cell junctions paracrine signalling quorum sensing exchange of mating factorsarrow_forward
- I am doing my microbiology homework and I need help with these questions: 1) List the structures ALL bacteria possess. 2) Identify three structures SOME but not all bacteria possess. 5) Describe the structure and function of three different structures found outside of the bacterial cytoplasmic membrane. 6) Differentiate between the two main types of bacterial envelope structures. 7) Why are Gram-positive cell walls stronger than Gram-negative cell walls? 8) Name a substance in the envelope of SOME bacteria that can cause severe symptoms in humans. 9) Describe the causes of sporogenesis and germination 10) Compare and contrast the major features of archaea, bacteria and eukaryotes by completing the table below. Characteristic Bacteria Archaea Eukarya Chromosome Type of Ribosomes Protein Synthesis Similar to Eukarya Sterols In Membrane Membrane-bound Organelles Peptidoglycan in Cell wallarrow_forwardMammalian cell cultures often are used for experimentation. The cell culture medium typically is supplemented with penicillin to prevent bacterial contamination of the cell line. However, researchers know that this antibiotic will not prevent Mycoplasma growth. Explain why penicillin does not protect the culture from Mycoplasma contamination.arrow_forwardIdentify 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.arrow_forward
- How does amoeba ingest a food particle through the process of phagocytosis? (very detailed please:) thank you)arrow_forwardHow would someone design an experiment to test the role of azithromycin on quorum sensing in Pseudomonas aeruginosa?arrow_forwardWhich one of the following statements about the Gram stain is false? A-In the Gram stain, a dye called crystal violet is used to stain the cells purple. B-Gram positive cells end up being stained purple. C-Gram negative cells have thinner peptidoglycan layers than Gram positive bacteria. D-In the Gram stain, alcohol is used to kill the bacteria E-Gram negative cells end up being stained pink or red.arrow_forward
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