Check Wikipdia. Best place to start is the American Constitution which if you're an American you should know backwards and forwards anyway. The Constitution is pretty clear, but lots of court rulings and infomal proceedures have generally expanded, in some cases restricted, his powers. Anyway too much to explain here.
There are two major types of DNA- Genomic DNA and Mitochondrial DNA; Genomic DNA / Nuclear DNA- This comprises the genome of an organism. This genomic DNA is spread across 46 chromosomes leading to an expression of genetic traits.The genomic DNA controls expression of the various traits in an organism.
There are at least 475 known and putative proteases and 103 homologs to known proteases in humans, and it is estimated that up to 1,200 human genes encode proteases.