Name
Penelope
20.1 The lysogenic Cycle
Class
Date
Visual Quiz
Label the diagram below with the following terms: DNA, bacterial chromosome, prophage,
viral proteins, bacterial cell wall. Then, answer the questions below,
2. The viral DNA inserts itself
into the
1. The virus injects
LYSOGÉNIC INFECTION
a bacterium.
5. Viral
enzymes lyse the
The new viruses
escape.
into
LYTIC INFECTION
New viruses are assembled.
6. What is a prophage? What is its role in the lysogenic cycle?
3. The
replicates.
The prophage
exits the bacterial
chromosome and
the virus enters a
lytic cycle.
4. The bacterium
makes new
and nucleic acids.
7. How is the lysogenic cycle similar to the lytic cycle? How are they different?
8. Give two examples of stimuli from the environment that can trigger a prophage to
become active.
9. Why are viruses considered to be parasites? Use the diagram above to help explain
your answer.
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