2. Based on your responses to the above macromolecules and your readings from the textbooks what can you use to identify the following macromolecules. nucleic acids: What makes DNA different from RNA: Proteins: Carbohydrates: Lipids: 3. When studying nucleic acids; you wanted to use a radioactive tag to label only RNA found in a cell (and NOT DNA), what compound(s) could you label that is specific to RNA? 4. If you wanted to label only DNA, what compound(s) could you label? .