Filamentous phages are unique in their ability to do what?

• A. To build and release new phages without killing the host cell.
• B. To cause the host cell to replicate and synthesize new viral DNA and viral proteins.
• C. To cause the host cell to lyse or burst open releasing new, infectious phages.
• D. To perform the lysogenic and lytic cycles within the host cell at the same time.

Answer: (A)

Verified step by step guidance

1. Understand the nature of filamentous phages: Filamentous phages are a type of bacteriophage that infect bacteria, particularly gram-negative bacteria. They are known for their long, thread-like structure.
2. Identify the replication process of filamentous phages: Unlike lytic phages, filamentous phages do not cause the host cell to lyse. Instead, they replicate their DNA and assemble new phage particles within the host cell.
3. Recognize the release mechanism: Filamentous phages are unique because they can extrude new phage particles through the host cell membrane without killing the host cell. This process allows the host cell to continue living and producing more phages.
4. Differentiate from lytic cycle: In contrast to the lytic cycle, where the host cell bursts open to release new phages, filamentous phages maintain the integrity of the host cell, allowing for continuous production of phages.
5. Clarify the absence of lysogenic cycle: Filamentous phages do not integrate their DNA into the host genome as seen in the lysogenic cycle. They continuously replicate and release new phages without entering a dormant state.