1. Radioactive isotope X has a half-life of 7 days. If 598 MCi of substance X is released into the environment, how much will remain after 33 days?
2. If a sample of I-131 is allowed to sit for 48 days some of the radioactive material will have undergone decay. If the half-life of I-131 is 8 days and the sample started out with a content of 600MCi, what is the content at the end of 48 days?

Transgenic Organisms
The development of transgenic organisms is an established technique in many laboratories. A transgenic organism is an organism that includes DNA from another organism in the cells of its body. This DNA is not only present, but it is also read by the cell’s transcriptionally machinery and is translated into a protein.

In your own words, explain the process of creating a transgenic organism.
What are some of the benefits of creating transgenic organisms?
What are some of the risks of creating transgenic organisms?
Share some examples of transgenic organisms you found in your research.

What species are used as the recipient of the transgene?
What species was the source of the transgene DNA?
Has human DNA been used as a transgene in another species?

What is the significance of the transgene being present in the germ cells of the organism?
The jellyfish gene for Green Fluorescent Protein (GFP) is frequently used as a transgene in many organisms.

What are the benefits of using GFP DNA?
What are some examples of transgenic organisms that have been developed using GFP?

Various foods have been genetically modified and are frequently referred to as genetically modified organisms (GMOs).

What are the benefits of GMOs?
What are the risks of GMOs?
Do you recommend that food labels indicate the presence of a GMO? Why or why not?

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Week 1 – Discussion 2 – Multicausality

The logical course of action when given a problem to solve is to first find the cause of the problem.  In human services, multicausality complicates this process.  Discuss the core principles of multicausality, and explain how this concept is central to understanding the human service field.  Provide an example of how ignoring multicausality might lead to an inadequate strategy of intervention when attempting to manage a specific problem.  For example:  Prohibition was implemented to curb drinking without an understanding of the complexity of alcohol abuse.  Include at least three of the principles of multicausality in your example to highlight your understanding of this concept.

1.  Kidneys were the first organs to be successfully transplanted. Because a donor can live a normal life with only one kidney, should a person be allowed to sell a kidney? Explain.
2.  Name one autoimmune disorder. How does it affect the immune system? Do you know someone who has an autoimmune disorder? How does it affect his or her life?
3.  Why is donating a kidney for money so taboo?
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