Laboratory Experiments in Microbiology (11th Edition)
11th Edition
ISBN: 9780321994936
Author: Ted R. Johnson, Christine L. Case
Publisher: PEARSON
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Chapter 23, Problem 3Q
Many of the microorganisms found on environmental surfaces are pigmented. Of what possible advantage is the pigment?
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Chapter 23 Solutions
Laboratory Experiments in Microbiology (11th Edition)
Ch. 23 - If the Bacillus had sporulated before exposure...Ch. 23 - What are the variables in ultraviolet radiation...Ch. 23 - Many of the microorganisms found on environmental...Ch. 23 - Why are there still some colonies growing in the...Ch. 23 - How might the results differ if a UVA lamp were...Ch. 23 - Legionella pneumophila in hospital...
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- What are the advantages of UV disinfection versus, or as acomplement to, chemical disinfection with chlorine?arrow_forwardList 5 physical methods of controlling microbial growth, and give an example of each. Why is moist heat much more effective than dry air?arrow_forwardDescribe how moisture affects the growth of microorganisms.arrow_forward
- how can ultraviolet be used to control microbial growth. which specific UV can be used to control microbe?arrow_forwardIn the exponential phase of microbial growth, Log cell numbers Time O a) net cell growth is equal to net cell death. Ob) net cell growth is greater than net cell death. c) waste accumulates, cell death is greater than cell growth. d) the cells stop growing.arrow_forwardWhy does treatment of human skin with alcohol not create a completely sterile environment?arrow_forward
- 1)What is the natural color of cytoplasm? How is it related to our need to stain bacterial cells? 2) Which of the following is the main goal when staining a culture? A) improve contrast B) identify bacteria C) Visualize bacterial structuresarrow_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_forwardHow do you observe growth in liquid microbiological media? a) the medium is cloudy or turbid b) colonies appear on the surface of the medium c) the medium becomes solid d) colonies appear distributes throughout the mediumarrow_forward
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Bacterial Structure and Functions; Author: Osmosis;https://www.youtube.com/watch?v=b15Hy3jCPDs;License: Standard youtube license