Later this semester we will discuss a type of protein called "G-protein linked receptors". These are examples of transmembrane proteins that extend all the way through a cell membrane, protruding into the extracellular environment and into the cell itself. Look at Figure 3.2 and select one amino acid that would
likely be found:
1. Protruding out of the membrane into the external environment. Explain your answer.
2. Found in the membrane itself. Explain your answer.

yes its like the dead sea which is full of salt which makes you stay afloat

so yes an egg will float in salt

it would be c. xylem.

"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."