Prescott's Microbiology
11th Edition
ISBN: 9781260211887
Author: WILLEY, Sandman, Wood
Publisher: McGraw Hill
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Textbook Question
Chapter 30.3, Problem 6CC
Why do cyanobacteria often dominate waters that have been polluted by the addition of phosphorus?
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Adding high levels of nutrients to a lake or inshore area wouldhave all of the following effects in that environment excepta) death of clams and crabs.b) increased growth of heterotrophic microbes.c) increased growth of photosynthetic organisms.d) increased levels of dissolved O2 .
Why is nitrogen fixation so energetically costly?
Organic forms of nitrogen are converted to inorganic forms via what process?
a)photosynthesis
b)consumption
c)nitrogen fixation
d)decomposition
Chapter 30 Solutions
Prescott's Microbiology
Ch. 30.1 - Prob. 1MICh. 30.1 - What factors influence oxygen solubility? How is...Ch. 30.1 - Describe the buffering system that regulates the...Ch. 30.1 - Prob. 3CCCh. 30.1 - What features of a thermocline make it similar to...Ch. 30.2 - How is sulfur cycled between the anoxygenic...Ch. 30.2 - Prob. 1.1CCCh. 30.2 - Prob. 1.2CCCh. 30.2 - How do heterotrophic microbes contribute to the...Ch. 30.2 - Prob. 3MI
Ch. 30.2 - What is marine snow? Why is it important in CO2...Ch. 30.2 - Prob. 2.2CCCh. 30.2 - Prob. 2.3CCCh. 30.2 - Prob. 2.4CCCh. 30.2 - Prob. 2.5CCCh. 30.2 - Explain what is meant by upside-down microbial...Ch. 30.2 - Prob. 2.7CCCh. 30.3 - Figure 30.15 Nutrient Cycling in Antarctic Lakes...Ch. 30.3 - How does the contribution of benthic autotrophs...Ch. 30.3 - Why does water turbulence play only a minor role...Ch. 30.3 - Why is mixotrophy suited for survival in Antarctic...Ch. 30.3 - What is an oxygen sag curve? What changes in a...Ch. 30.3 - What are point and nonpoint source pollution? Can...Ch. 30.3 - Prob. 4CCCh. 30.3 - Prob. 5CCCh. 30.3 - Why do cyanobacteria often dominate waters that...Ch. 30 - Prob. 1RCCh. 30 - Prob. 2RCCh. 30 - Prob. 3RCCh. 30 - Prob. 4RCCh. 30 - Prob. 5RCCh. 30 - Prob. 6RCCh. 30 - Prob. 7RCCh. 30 - Prob. 8RCCh. 30 - The unicellular cyanobacterium Prochlorococcus sp....Ch. 30 - Prob. 2ALCh. 30 - It is well known that bacterivory (the consumption...Ch. 30 - Prob. 4AL
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- Why are organisms in the abyssal zone of the ocean necessarily halophilic, psychrophilic, barophilic, and anaerobic?arrow_forwardWhy is it important that decomposers such as bacteria release nutrients?arrow_forwardWhich process allows water to enter the atmosphere? A) Transpiration B) Respiration C) Condensation D) Evaporationarrow_forward
- Which among A-D is not a step in the eutrophication process? A) O rapid growth of algae and cyanobacteria B) O influx of excess nutrients to an aquatic environment, particularly nitrogen and phosphorous C) O heterotrophic, aerobic respiration D) O eventual increase in the numbers of fish and other aquatic life due to the rise m oxygen concentration of the water E) OA-D are all a part of eutrophicationarrow_forwardGiven that the bottom of the ocean is anaerobic, what process in the nitrogen cycle is likely to be occurring in this location?arrow_forwardWhy is it important to reduce the amount of biodegradable organic matter and nutrients during sewage treatment?arrow_forward
- Which of the following is incorrect? a) Chemoheterotrophs obtain their energy from an organic compound b) Photoautotrophs obtain their carbon from an organic compound c) Both carbon and energy can be transferred from photoautotrophs to chemoheterotrophs d) Chemoheterotrophs are found in higher trophic levels of a food chain e) Photoautotrophs are considered primary producersarrow_forwardWhat are persistent organic pollutants (РОPS)?arrow_forwardWhich of these are known to host chemosynthetic communities? a) Hydrothermal vent O b) Hydrocarbon seep c) Hypersaline seep d) All of the above.arrow_forward
- Which process is a source of phosphorus in ecosystems? A) Erosion of rock by water B) Fixation by bacteria in soil C) Respiration by Plants and Animals D) Photosynthesis by plants and algae.arrow_forwardWhich of the following could be an effect of an excess ofsewage running into a freshwater reservoir?(a) It could cause the water to become polluted and nonpo-table.(b) It could cause an increase in the biological oxygen de-mand (BOD).(c) It could cause oxygen depletion, leading to an increasein the anaerobic microbial population.(d) Large quantities of organic wastes could be left behind,killing off many plants and animals or causing animalsto migrate.(e) All of the above.arrow_forwardBiomagnification is the process by which the level of contaminants increase as they move upwards in a food chain. If bivalves in the Chesapeake Bay become contaminated from run-off, which organism will experience the highest level of contamination? a) Bivalves b) Sea duck c) Tundra swan d) Bald eaglearrow_forward
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