Review

Short Answer

1. What is the name given to the phage whose DNA can be integrated into the host chromosome? What is the name of the host cell containing the phage DNA?

2. Name the process by which prophages confer new properties on their host cells.

3. Name the two types of transduction. Explain how they differ from each other in the DNA that is transferred.

4. Do all productive infections result in the complete takeover of host metabolism by the phage? Explain your answer.

5. Name three structures of bacteria that contain receptors for phage.

6. List the two mechanisms that allow bacteria to resist phage infection.

7. What is the most common shape of phages?

8. Compare double-stranded DNA phages with single-stranded filamentous DNA phages in terms of cell lysis and number of phages produced.

9. How does UV light induce the synthesis of virions from lysogenic bacteria?

10. In virulent phage infection, why is it important that not all phage-induced enzymes be synthesized simultaneously? What general classes of enzymes are synthesized first? What class is synthesized last?

Multiple Choice Questions

1. Capsids are composed of

D. lipids. E. polysaccharides.

2. Temperate phages often

1. lyse their host cells.

2. change properties of their hosts.

3. integrate their DNA into the host DNA.

4. kill their host cells on contact.

5. are rare in nature.

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