Free Response Questions
Chapter 18

1. Describe and illustrate the lytic cycle. Be sure to describe what kind of virus causes it and what kind of organism experiences it.

2. Describe and illustrate the lysogenic cycle. Be sure to describe what kind of virus causes it and what kind of organism experiences it. Discuss what a prophage is.

3. HIV
a. Diagram and describe the different parts of the Human Immunodeficiency Virus (HIV).
b. Diagram and describe how HIV infects, is reproduced, and is expelled from a host cell. Be sure to discuss the nature of retroviruses, reverse transcriptase, and how this group of viruses demonstrate a violation of the Central Dogma.
Use figure 18.7 and/or the CD ROM Activity 18.4

4. Describe the 3 different ways bacteria can exchange DNA. Include illustrations for transduction and conjugation.

5. Explain clearly the Lederberg-Tatum experiment. Why was it important?

6. Describe and illustrate the workings of a repressible operon using the trp operon as an example. Use my lecture, figure 18.19, and the textbook pages 337-339 to guide you in writing your answer.

7. Describe and illustrate the workings of an inducible operon using the lac operon as an example. Use my lecture, figure 18.20, and the textbook pages 339-340 to guide you in writing your answer.