Here's a breakdown:

* DNA (deoxyribonucleic acid): Contains the genetic instructions for building and maintaining an organism. It's like a blueprint for life.

* RNA (ribonucleic acid): Plays a crucial role in protein synthesis. It acts as a messenger, carrying instructions from DNA to the ribosomes (protein factories) of the cell.

So, while nucleic acids have various other functions, their core role is to ensure the faithful transmission of genetic information from one generation to the next and to guide the synthesis of proteins essential for life.