Chapter 5A Homework Questions

1. What are the four major classes of biological molecules?

2. Classify the following as a monomer or poly merand to which class of biological molecule it belongs: adenosine, starch, ovalbumin, L-dopa, L-threonine, cholesterol, lignin, phospholipid, cellulose, glycine, catalase, estrogen, insulin, RNA, polyadenylic acid?

3. Polymers are usually broken down and synthesized by what types of reactions, respectively?.

4. What is the functional groups that are found in sugars. What are the three most common polysaccharides found in nature?

5. Milk contains a sugar-what is it?.

6. What is the difference between a trans-fat and a cis-fat?

7. What effect on the physical properties of a fat molecule does a double bond in the fatty acid portion of a lipid have?

8. What other molecules besides fats and steroids would be considered to have lipid-like characteristics (Hint: they are found mostly in plants.

9. What is the major difference between plant and animal lipids?

10. How does a dient rich in certain lipids contribute to heart disease? Is diet the only factor involved in heart disease and if not what else is?