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Steps in the Replication of T4 Phage in E. Coli (Quiz 2)

Why are viruses virulent? Viruses require cells to replicate themselves. They are parasites. They are also pathogens, entities that cause disease. Pathogens vary in their virulence, the extent to which they are harmful to their hosts. Pathogens may evolve reduced virulence if their probability of transfer to a new host at any given point in time is low. If a virulent virus had a low probability of reaching a new host, individual viruses that did not seriously harm their host would tend to persist. Highly infectious viruses such as those causing influenza will not tend to evolve reduced virulence.

View the animation below, then complete the quiz to test your knowledge of the concept.






1In the attachment step of phage replication
A)attachment is nonspecific
B)carbohydrate receptors in the phage tail attach to specific receptors on the bacterial cell wall
C)protein fibers in the phage tail attach to specific receptors on the bacterial cell wall
D)phage DNA exits the protein coat and attaches to receptors on the bacterium



2In phage replication
A)only the phage nucleic acid enters the bacterial cell
B)the whole phage particle enters the cell and the protein outer coat is removed
C)multiple phage particles enter the same host bacterial cell at the same time
D)only the phage protein enters the bacterial cell



3The correct order of the stages for phage replication are
1= assembly
2 = attachment
3 = transcription/replication
4 = release
5 = penetration
A)5, 2, 3, 1, 4
B)2, 5, 3, 1, 4
C)2, 5, 1, 3, 4
D)5, 2, 1, 3, 4



4Viral lysozyme digests the host cell wall, releasing the newly made phage, and lysing the host cell in the release step.
A)True
B)False



5Viral nucleic acid is made inside the bacterium and is combined with viral protein coat already present outside.
A)True
B)False







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