1. What is the chemical composition of (1) proteins, (2) lipids, (3) carbohydrates and (4) nuclei acids? 2. Which of of the 4 types of biological molecules are often composed of only C, H, & O? 3. Which of the 4 types of biological molecules can be identified by looking at the C:H:O ratios alone? 4. What other elements are commonly associated with each of these four types of macromolecules? a) Which of the 4 types of biological molecules always contain P? b) Which of the 4 types of biological molecules always contain N? c) Which of the 4 types of biological molecules frequently contain S? 5. Based on your answers to questions 1-4 and what you learned from the readings in your textbook what simple rule(s) can you use to identify the following macromolecules? a) nucleic acids b) DNA versus RNA c) proteins d) carbohydrates e) lipids f) phospholipids versus triglycerides