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Question
Read the following scenario to answer the following question(s).Endotoxins are commonly found in the air, both inside and outside our homes. These "air endotoxins" can come from sources that include house dust mites, agricultural and industrial dust, and dust from indoor pets. Air endotoxins are typically found in low amounts, but production of them can increase dramatically under specific environmental conditions such as dampness, mold, and sewage. Many scientific studies have been conducted investigating possible links between indoor endotoxin levels and asthma, chronic bronchitis, and other upper respiratory diseases. Interestingly, some studies have found positive correlations between indoor endotoxin exposure and severity of some of these diseases while other studies have suggested that some air endotoxin exposure can actually decrease the risk of developing asthma in children. Additionally, data suggests that industrial workers who are exposed to endotoxins in the air can develop irreversible lung damage.
In 2005, Hurricane Katrina devastated the eastern coastline of the United States. The state of Louisiana, and in particular the city of New Orleans, experienced tragic loss of human life and homes due to the failure of the levee system. Intense flooding destroyed homes and created severe exposure to wet, moldy surfaces. At that time there were no regulations in existence on the amount of exposure that individuals should have to air endotoxins. Scientists from the Natural Resources Defense Council who wanted to determine if endotoxin levels had risen in New Orleans, conducted tests across 12 outdoor areas, 9 of which had been significantly flooded while the other 3 were less affected. Two indoor areas were also sampled for endotoxin levels. No significant differences were found in endotoxin levels between the flooded and non-flooded areas or between the indoor and outdoor areas. However, a limited number of samples were collected, and they were taken after a recent dry spell. Endotoxin levels at all sites were found to be higher than national average levels but were lower than levels typically associated with long-term changes in lung function.
What is an implication of the fact that tests were conducted after a period of dry weather?
A) Dry weather creates harsher sampling conditions for scientists.
B) If more periods of rainfall occur after the testing, bacteria that secrete endotoxins may increase, thereby increasing endotoxin levels.
C) Dry weather increases the amount of carbon available for the endotoxin bacteria to use for organic compound production.
D) The endotoxin bacteria are better able to be used for bioremediation efforts in dry weather than in wet weather.
Answer
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Related questions
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Please read the following scenario to answer the following questions.
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C) ecosystem
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B) a group of organisms of the same species living in a particular geographic area
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C) a three-part body: head, thorax, and abdomen
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A) the ability to produce sweat to cool their bodies
B) the ability to shiver to create body heat
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D) the ability to dig deep holes to find groundwater
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How do sponges differ from all other animals?
A) Sponges exhibit radial symmetry.
B) Sponges are autotrophs.
C) Sponges lack a true body cavity.
D) Sponges lack true tissues.
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Q:
Read the following scenario to answer the following questions.
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What would NOT be an advantage of using oil from jatropha seeds?
A) The oil is considered a renewable resource.
B) The oil can be used for generating electricity.
C) The oil can be used as a biofuel.
D) Growing jatropha tress to produce oil may lower food production.
Q:
What important role do fungi play in many ecosystems?
A) They decompose organic material.
B) They pollinate plants.
C) They disperse the fruits of angiosperms.
D) They perform photosynthesis.
Q:
Like plants, fungi have ________; however, in plants they are composed of ________, whereas in fungi they are composed of ________.
A) cell walls... cellulose... chitin
B) cell walls... cellulose... peptidoglycan
C) cell membranes... phospholipids... chitin
D) cell walls... phospholipids... cellulose