CPX079: 0.1 inch (2.54 mm) pitch polarizing key. Insert used to block hole of header connector, for correct connection / orientation to motherboard pin-outs.
The function of DNA in a cell is to code the way proteins turn genes on or off. the function of DNA is to make the proteins. DNA is the foundation of life. It's a complex molecule made up of four types of bases, cross connected like a staircase, and twisted into a spiral.
DNA has two main biological functions (aside from being a very elegant looking macromolecule). Primarily, it serves to store/determine the biological characteristics of any living thing according to a very specific arrangement of molecular connections, as will be defined in a later section of this site.