This video captures the beauty of "The Central Dogma" of molecular biology, which is that "DNA makes RNA makes protein". (For you twitter fiends, this translates as "DNA>RNA>protein".)

This nicely done animation describes how proteins act similarly to "molecular machines" to copy, or transcribe, specific genes in the DNA of every cell into small, portable RNA messages, how those messenger RNAs are modified and exported from the cell nucleus and finally, how the RNA code is translated to build proteins -- a process known as "gene expression."