As an analogy - DNA is source code. The first arrow is the parser and creates RNA that is a reflection of the DNA. The second arrow (RNA to protein) is the comp

As an analogy - DNA is source code. The first arrow is the parser and creates RNA that is a reflection of the DNA. The second arrow (RNA to protein) is the compiler, taking the parsed code (RNA) and generating a program (protein) from it. At no point is the source code consumed to create the program, akin to DNA.