Biology: The Unity and Diversity of Life (MindTap Course List)
Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN: 9781337408332
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 20, Problem 1CT
Summary Introduction

To explain: Ecological roles of bacteria and disruption of those roles by antibiotic pollution.

Concept introduction: Bacteria are the unicellular prokaryotes that are generally considered as a pathogen (harmful pathogenic bacteria) but ecologically plays an important role in the environment. Those beneficial bacteria can act as decomposers, nitrogen fixators, agent for bioremediation and waste water treatment, and so on. But the antibiotic discharge from the industrial outlet may be one off the main risk involved in the disruption of the ecological role played by the bacteria. This risk is because of the development of antibiotic resistance in the existing bacteria and turns into more pathogenic organisms.

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  • Most ecosystems on Earth rely on sunlight as the primary energy source for the synthesis of organic compounds that living organisms need. Sunlight does not penetrate deep enough in the ocean to provide energy for organisms living near hydrothermal vents. How can these densely populated communities survive without energy from the sun? A. chemoheterotrophic bacteria convert organic compounds into carbon dioxide which is used by other organisms as an energy source B. chemoautotrophic bacteria harvest chemical energy from hydrogen sulfide and then provide the basis of food for the vent communities C. chemoheterotrophic bacteria harvest chemical energy from hydrogen sulfide and then provide the basis of food for the vent communities D. chemoautotrophic bacteria fix nitrogen which then is used as a source of energy for other organisms
    Nitrogen fixation is the processa. that converts organic nitrogen to NH3.b. by which plants and animals take up NO3–.c. by which bacteria convert NO3– to N2.d. by which N2 is converted to NH3 or NH4+.e. All of the above are true of nitrogen fixation.
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