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2025 Fall 2 ENVS 2126E for Melissa Driessnack (Online)
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A research team studying microbial life in the McMurdo Dry Valleys, Antarctica, discovers bacteria that remain metabolically active despite subzero temperatures and limited nutrient availability. What is the MOST LIKELY adaptation that allows these microorganisms to survive in this extreme environment?
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In the McMurdo Dry Valleys of Antarctica, microbial communities show adaptations to extreme cold and seasonal light variations. Which of the following adaptations most directly supports the survival of sulfur-oxidizing bacteria in the unique chemocline of Lake Fryxell?
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Microbes found in geothermal features, such as hot springs, often use this element to complete their range of biological processes.
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Microbial communities in Kartchner Caverns (Arizona, USA) thrive despite extremely low organic carbon availability. Genetic analysis suggests that archaea contribute significantly to the ecosystem’s energy flow. Which metabolic strategy is MOST LIKELY responsible for primary production in this cave ecosystem?
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Epsilonproteobacteria are most dominant in hydrothermal vents because they
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Scientists investigating hydrothermal vents at the ocean floor find thriving chemoautotrophic bacteria despite the absence of sunlight and extreme conditions. Which of the following processes is MOST responsible for sustaining microbial life in this aphotic environment?
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Chemoautotrophic Systems::Match each system with its key microbial or metabolic feature.
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A mining site contaminated with acid mine drainage (AMD) has a pH below 2 and contains high concentrations of toxic metals. Despite the harsh conditions, microbial communities thrive. Which microbial group is MOST LIKELY responsible for biogeochemical cycling in this environment?
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Which statement exemplifies the microbial loop concept?
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Phylogenetic analyses of marine prokaryotic diversity in both shallow and deep-sea marine sediments have found that both types of sediments are dominated by ______.
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