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 is the genetic material, and genes are made of DNA. DNA therefore has two essential functions: replication and expression. 1  Replication means that the DNA, with all its genes, must be copied every time a cell divides.  Expression means that the genes on DNA must control characteristics.