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Multiple Choice
What normally happens to viral DNA when it enters a bacterial cell during a lysogenic cycle?
A
The viral DNA is immediately transcribed and translated into viral proteins.
B
The viral DNA integrates into the bacterial chromosome.
C
The viral DNA forms a plasmid that replicates independently.
D
The viral DNA is degraded by bacterial nucleases.
Verified step by step guidance
1
Understand the lysogenic cycle: In the lysogenic cycle, the viral DNA integrates into the host cell's genome, becoming a part of the bacterial chromosome.
Recognize the difference between the lysogenic and lytic cycles: Unlike the lytic cycle, where viral DNA is immediately transcribed and translated, the lysogenic cycle involves integration into the host genome.
Identify the role of integrase: The viral DNA uses an enzyme called integrase to integrate into the bacterial chromosome, allowing it to be replicated along with the host DNA during cell division.
Consider the stability of viral DNA: Once integrated, the viral DNA remains dormant and does not immediately produce viral proteins, allowing the virus to persist in the host without causing immediate harm.
Note the potential for activation: Environmental factors or stress can trigger the viral DNA to exit the lysogenic cycle and enter the lytic cycle, leading to the production of new viral particles.