Lytic Cycle of Viral Replication

University:
Harrisburg University of Science and Technology
Course:
BIOL 370 | Molecular Biology
Academic year:

2023
Views:

295

Pages:

2
Author:

Marques Townsend

Release of new viruses by lysis of bacterial cell wall Assembly of new viruses complete Viral tails being assembled Replication of viral nucleic acid and proteins by the bacterial cell’s metabolic machinery Viral nucleic acid Bacterial (host) DNA Date Lytic Cycle of Viral Replication Expression of viral genes to produce structural components of new viruses, using bacterial materials Viral heads being assembled Viral nucleic acid Virus Attachment of virus to E. coli and injection of viral nucleic acid 27 Tail Head Master Tail fibers Nucleic acid T4 bacteriophage Name Class Reteaching Skills Name Date Worksheet 27 Lytic Cycle of Viral Replication Class Reteaching Skills 1. How does the viral nucleic acid enter the bacterial host cell? The viral nucleic acid enters the bacterial host cell through injection or endocytosis. 2. Describe how new viruses are produced in the host cell. New viruses are produced in the host cell by hijacking its machinery to replicate viral nucleic acids and synthesize viral proteins, followed by assembly of new virus particles. 3. Describe the last step of the lytic cycle. The last step of the lytic cycle is host cell lysis, where the cell ruptures, releasing newly formed viruses. 4. Sometimes the lytic cycle occurs after a lysogenic cycle. What events occur in the lysogenic cycle? In the lysogenic cycle, the viral DNA integrates into the host cell's chromosome, replicating along with it. 5. A type of virus, called a retrovirus, must go through an extra step before entering the lysogenic cycle. Explain this extra step. Retroviruses undergo reverse transcription, converting viral RNA into DNA, which then integrates into the host cell's chromosome. 6. Explain why viruses would cease to exist if they replicated via the lytic cycle only. If viruses relied only on the lytic cycle, they would eventually deplete their host population, leading to extinction.