An animal cell placed in a hypertonic solution will shrink in a process called crenation. an animal cell placed in a hypotonic solution will swell and potentially burst in a process called hemolysis.
to prevent crenation or hemolysis, an animal cell must be placed in an isotonic solution such as 0.9% (m/v) nacl or 5.0% (m/v) glucose. this does not mean that a cell has a 5.0% (m/v) glucose concentration; it just means that 5.0% (m/v) glucose will exert the same osmotic pressure as the solution inside the cell, which contains several different solutes.
a red blood cell is placed into each of the following solutions. indicate whether crenation, hemolysis, or neither will occur.
solution a: 3.21% (m/v) nacl
solution b: 1.65% (m/v) glucose
solution c: distilled h2o
solution d: 6.97% (m/v) glucose
solution e: 5.0% (m/v) glucose and 0.9%(m/v) nacl

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."

c should be the answer