Question

gene expression can occur at several points along the pathway from DNA to RNA to proteins. In one example of gene expression, the protein insulin must be trimmed to a smaller size. How is this an example of gene expression?

Answer 1

These products are often proteins, but in non-protein coding genes such as  Several steps in the gene expression process may be modulated, including the  The stretch of DNA transcribed into an RNA molecule is called a transcription unit