Unit+2+Practice+quiz+questions

Chemistry of Life

1. Describe the structure of a molecule. In other words, what are molecules composed of?

2. There are four classes of biological macromolecules. Identify one and describe the importance of this molecule in organisms (what are its functions)?

3. Enzymes perform a major role in the life or organisms. What is this role?

4. Identify two properties of water and identify a living organism that depends on each property to survive.

5. Molecules undergo chemical reactions in organisms. Identify one chemical reaction a molecule might undergo and describe the importance of this reaction occurring in the organism. (What would happen if it couldn't occur?)

6. Carbohydrates are essential to plants. Identify two reasons why.

7. Most cells are composed of about 40% protein molecules. What are two functions of proteins for cells?

8. Lipids are non polar molecules. Identify the main function that lipids serve in organisms because of this property. Describe how that property allows the function to occur.

9. All cells contain DNA. How is DNA used to direct all cell activities?

10. Carbon is the most commonly found atom in all biological macromolecules. What importance does Carbon serve to the structure of these molecules?