Assignment_1_Answer_Key (1)

Assignment_1_Answer_Key (1) - Assignment 1 Answer Key ETOX...

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Assignment 1 Answer Key ETOX 102A (10 points total) 1). Mercury goes through a key transformation making it capable to undergo bioaccumulation. What is the definition of bioaccumulation? What transformation process makes Mercury capable of accumulation? Where does this transformation process occur in the Mercury cycle? (3 pts) Bioaccumulation can be described as the gradual build up of a chemical in an organism (1 pt). Mercury undergoes methylation making it lipophilic and easily storable in adipose tissue (1 pt). Methylation of Mercury occurs in the sediment by anaerobic microbes (1 pt). 2). Environmental contamination and pollution can occur in many ways – both from point sources (direct) and non-point sources (indirect). In some cases, chemicals that are released into the environment can partition between compartments and deposit into sinks. How are environmental sinks defined? What two features characterize sinks? Please provide one example of an environmental sink. (3 pts) An environmental sink is a natural reservoir that can act as a short or long-term repository
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