Prescott's Microbiology
10th Edition
ISBN: 9781259281594
Author: Joanne Willey, Linda Sherwood Adjunt Professor Lecturer, Christopher J. Woolverton Professor
Publisher: McGraw-Hill Education
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Chapter 28.2, Problem 4RIA
Summary Introduction
Soil microbial communities play crucial roles in the ecosystem. They affect the functionality of the soil through their actions in cycling the soil nutrients and carbon storage. Hence, they play a crucial role in regulating nutrient cycling, stabilization and carbon mineralisation.
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Chapter 28 Solutions
Prescott's Microbiology
Ch. 28.1 - Prob. 1MICh. 28.1 - What microbes are capable of methanogenesis and...Ch. 28.1 - What are the products of denitrification,...Ch. 28.1 - Prob. 4MICh. 28.1 - Prob. 5MICh. 28.1 - Prob. 1.1RIACh. 28.1 - Prob. 1.2RIACh. 28.1 - Prob. 1.3RIACh. 28.1 - Prob. 1.4RIACh. 28.1 - Prob. 1.5RIA
Ch. 28.1 - Prob. 2.1RIACh. 28.1 - Prob. 2.2RIACh. 28.1 - Prob. 2.3RIACh. 28.1 - Prob. 2.4RIACh. 28.1 - Compare the products of dissimilatory sulfate...Ch. 28.1 - Prob. 3.2RIACh. 28.1 - Prob. 3.3RIACh. 28.1 - Prob. 3.4RIACh. 28.1 - Suggest how a chemolithoautotroph might link the...Ch. 28.2 - What organisms benefit from nitrification?Ch. 28.2 - List three greenhouse gases. Discuss their...Ch. 28.2 - Prob. 2RIACh. 28.2 - How do changes in the nitrogen cycle caused by...Ch. 28.2 - Prob. 4RIACh. 28 - Compare the production of N2 gas by...Ch. 28 - Prob. 2CHICh. 28 - A bacterium isolated from sewage sludge was...Ch. 28 - It is well documented that aquatic ecosystems have...
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- Soil microorganisms, collectively referred to as dizotrophs, fix 90% of the inert nitrogen gas to ammonium and nitrate. There are two-main types of nitrogen-fixing bacteria: free-living (nonsymbiotic) and mutualistic (symbiotic). Describe the mutualistic relationship between Rhizobium and legumes. What is the advantage of using legumes as a cover crop in agricultural systems? A point of interest is that the nitrogenase enzyme complex is highly sensitive to oxygen. This is a major problem for free-living aerobic species such as cyanobacteria and species of the genera Azotobacter and Beiigrinckia. Describe two ways the bacteria can overcome to levels of oxygen in their cells.arrow_forwardWhich of the following statements is NOT as description of soil? A. Varying nutritional content. B. Phototropic microbes are found only on the top few centimeters. C. A homogenous layer of organic and inorganic material. D. The area around the plant soil usually has the highest microbial populations.arrow_forwardWhat factors govern the extent and type of microbial activityin soils?arrow_forward
- Why are some microbial habitats unsuitable forplant and animal life?arrow_forwardSoil-based nitrogen-fixing bacteria appear to be highly vulnerable to exposure to UV radiation. Suppose that the ozone level continues to be depleted, what are the long-term effects on the planet?arrow_forwardWhich of the following factors would explain why there is a decreasing trend of microbial population from top to bottom? A. There is a shift in the condition form oxic to anoxic. B. All statements are acceptable. C. The soil particles become larger and not weathered. D. There is a decrease in the available nutrients.arrow_forward
- Which of the following statements is not true about bioremediation and biodegradation? Microbes played a critical role in metabolizing the crude oil in the Deepwater Horizon spill in the Gulf of Mexico. Oil-degrading microbes have enzymes that use molecules in the oil as substrates. Phosphorus and nitrogen stimulate the growth of oil-degrading microbes. dding easily metabolized organic matter such as glucose increases biodegradation. The biodegradation of plastics is fast because of their chemical structure and properties.arrow_forwardWhile leafy greens are nutritionally rich, raw greens are also a significant source of foodborne illnesses. From 2014 to 2018, there were 51 foodborne disease outbreaks reported to the CDC linked to leafy greens, but the actual number of illnesses is likely much higher because more foodborne illnesses are not part of a recognized outbreak. Imagine you are a researcher interested in studying the microbial community on leafy greens from many different commercial sources. →You notice that many of the species identified are capable of forming biofilms. You hypothesize that biofilm formation is also important for causing foodborne illnesses. What features of biofilms would make them important in causing foodborne illness from leafy greens? What structural component(s) of the E. coli cell might play a role in initial biofilm formation on leafy greens?arrow_forwardWhy do you suppose this habitat contains such a high microbial count?arrow_forward
- In simpler terms explain Lag, Log, Stationary, and Death Phase in the Microbial Growth Curve?arrow_forwardAn extremely acid soil generally limits the availability of many nutrients in the soil. True or Falsearrow_forwardWhy a medium of a biofilter should have a high content of inorganic nutrients?arrow_forward
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