Trace amounts of dioxin were present in agent orange, a defoliant sprayed on vegetation during the vietnam war. animal tests suggest that dioxin can cause birth defects, cancer, liver and thymus damage, and immune system suppression, sometimes leading to death. but the animal tests are equivocal; a hamster is not affected by a dose that can kill a guinea pig. dioxin acts like a steroid hormone, entering a cell and binding to a cytoplasmic receptor that then binds the cell’s dna. how might this mechanism explain the variety of dioxin’s effects on different body systems and in different animals? how might you determine whether a type of illness is related to dioxin exposure? how might you determine whether a particular individual became ill as a result of exposure to dioxin? which would be more difficult to demonstrate? why?
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Biology, 21.06.2019 19:00
The diagram shows a fossil of an ancient whale skull and a skull of a present-day whale. the ancient whale is extinct and is believed to be an ancestor of the present-day whale. what do these skulls most likely show that supports darwin’s theory of evolution? all populations can adapt and survive. only some organisms have a common ancestor. populations change slowly over time. populations rapidly become extinct.
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Biology, 22.06.2019 07:00
What molecules will be best used to compare different species with the exact same sequence of amino acids? why would two species have the same protein even if the molecules in question is different? (hint: transcription to translation to protein).
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Biology, 22.06.2019 10:20
Casts and mold are a type of preservation where the original material decays, leaving a mold in surrounding rock that can be filled with another sediment a. true b. false
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Trace amounts of dioxin were present in agent orange, a defoliant sprayed on vegetation during the v...
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