How do bacteriophages replicate?

Practice Questions

Q1
How do bacteriophages replicate?
  1. Binary fission
  2. Budding
  3. Lytic and lysogenic cycles
  4. Mitosis

Questions & Step-by-Step Solutions

How do bacteriophages replicate?
  • Step 1: A bacteriophage attaches to a bacterium (the host) using its tail fibers.
  • Step 2: The bacteriophage injects its genetic material (DNA or RNA) into the bacterium.
  • Step 3: In the lytic cycle, the bacteriophage takes over the bacterium's machinery to make copies of itself, leading to the production of new bacteriophages.
  • Step 4: The bacterium eventually bursts (lyses), releasing the new bacteriophages to infect other bacteria.
  • Step 5: In the lysogenic cycle, the bacteriophage's genetic material integrates into the bacterium's genome and can remain dormant for a while.
  • Step 6: The bacterium replicates normally, copying the bacteriophage's genetic material along with its own.
  • Step 7: Under certain conditions, the bacteriophage can exit the lysogenic cycle, enter the lytic cycle, and produce new bacteriophages.
  • Lytic Cycle – A process where bacteriophages infect a host cell, replicate, and ultimately cause the cell to lyse, releasing new phages.
  • Lysogenic Cycle – A process where bacteriophages integrate their genetic material into the host's genome, allowing for replication along with the host cell without immediate destruction.
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