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2025 Fall 2 ENVS 2126E for Melissa Driessnack (Online)
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A water treatment plant is experiencing persistent bacterial contamination despite regular disinfection. The bacteria are found attached to pipe surfaces, forming thick extracellular matrices that protect them from chlorine treatment. Which microbial community structure is MOST responsible for this issue?
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In a stratified lake, the warmer and less dense layer is called the _______.
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Aquatic Microbial Habitats::Match each aquatic habitat with its description.
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Cells within a biofilm excrete an adhesive matrix primarily composed of ________.
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The earliest stromatolites were probably formed by _______.
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Microbes in biofilms often demonstrate _______ antibiotic ______.
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A limnologist is studying a stratified lake in the summer. She observes that oxygen levels in the deeper water are nearly absent, while the surface remains oxygen-rich. However, microbial activity is still present at deeper depths. Which microbial process is MOST LIKELY dominant in the anoxic layers of the lake?
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Methanotrophs use this for a source of carbon.
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You are studying a highly transmissible respiratory virus that readily infects humans and dogs, there is also no known treatment or vaccine exist for the virus. The viruses can cause lethality in about 30% of infected individuals, which of the following is an appropriate biosafety approach?
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A group of scientists is studying microbial survival in aerosols under different environmental conditions. They expose a bioaerosol containing Gram-negative bacteria to various humidity levels and observe rapid inactivation at high relative humidity (>80%). What is the MOST LIKELY explanation for this observation?
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