This is a macromolecule that holds cell information in a coded form. made of sugar, phosphate and nitrogen-containing bases.

This macromolecule is nucleic acid-deoxyribonucleic acid (DNA).

DNA is the genetic material that carries the hereditary information which provides instructions for how and when to make proteins needed to build and maintain the function of the cells.Beside DNA ribonucleic acid (RNA) is also a variety of nucleic acids, macromolecules made out of units called nucleotides.

"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."

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs