Outline 3 human uses of estuaries that impact their ecology
What will be an ideal response?
Humans rely on important estuary-dependent species for food such as oysters, crabs, scallops, shrimp and fish. Human dredging and filling in of estuaries combined with pollution affect the size and quality of estuaries. Up-river dams modify the flow of water, sediment, and woody debris that historically influenced the physical environment of the estuary.
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In the 1800s, northern Minnesota was covered with heavy forests. After the forests were logged off, the land was sold for farms. The majority of the farms failed because the land became waterlogged. Why did this happen?
What will be an ideal response?
The interferon-gamma release assay for tuberculosis infection works because
A) individuals who have had the TB vaccine can be identified by the amount of interferon-gamma in their blood. B) the presence of interferon-gamma indicates a person is susceptible to TB infection. C) the T cells of an infected person release more interferon-gamma than that of a non-infected person. D) one can perform an indirect ELISA to detect antibodies to interferon-gamma in a patient with TB. E) the TB bacterium releases interferon-gamma.
The difference between innate immunity and adaptive immunity is that
A) adaptive immunity attacks pathogens; innate immunity attacks microbes. B) innate immunity targets cancers and transplants; adaptive immunity targets viruses and bacteria. C) innate immunity is fast and generalized; adaptive immunity is slow and specific. D) adaptive immunity releases cytokines; innate immunity produces antibodies.
The region of the brain with the highest concentration of neurons is the ____
a. hypothalamus b. cerebrum c. cerebellum d. pons e. medulla oblongata