Just like the "junk DNA" of the 1990's wasn't junk either. We're just scratching the surface of the complexity encoded into DNA and RNA. It's not the base pai

Just like the "junk DNA" of the 1990's wasn't junk either. We're just scratching the surface of the complexity encoded into DNA and RNA. It's not the base pairs that are expressed, all the stuff not expressed is encoding information as well. DNA, like proteins, encodes information in the way it folds itself around histones. DNA can't be expressed if it's still in a compact state! So it look like RNA is similar. The noncoding sections are part of the system that regulates how the encoding parts are encoded.