1. Ch. 3 sec. 2 Answers

2. 1. List the four main classes of organic compounds.

4. 2. What are the elements, and their ratios, in a carbohydrate?

5. Carbon, Hydrogen, Oxygen 1:2:1 Ex: Glucose

6. 3. How are glucose, fructose, and galactose similar and how are they different?

8. 4. Define isomers.

10. 5. What are the monomers that form proteins called?

12. 6. What are two amino acids bonded together called?

14. 7. For an enzyme reaction, what two things must physically fit for it to work?

16. 8. What is an active site for an enzyme?

18. 9. Can an enzyme be reused?

20. 10. Why do lipids store more energy than other organic compounds?

22. 11. What is the difference between hydrophilic and hydrophobic?

24. 12. How are the carbon bonds different in saturated and unsaturated fatty acids?

26. 13. What is a triglyceride composed of?

28. 14. How is a phospholipid different from a triglycerides?

30. 15. For a phospholipid, which is hydrophobic—the head or the tail?

32. 16. Where can wax be found in animals?

34. 17. Why is cholesterol needed in humans?

36. 18. What is the monomer for nucleic acids?