Multiple Choice
Which structure does a virus have in common with a prokaryotic cell?
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17. Viruses
Viruses
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What happens first when a phage infects a bacterial cell and is going to enter a lysogenic cycle?
A
The phage DNA integrates into the bacterial chromosome.
B
The bacterial cell produces viral proteins and assembles new phages.
C
The phage immediately begins to replicate and lyse the host cell.
D
The phage DNA is transcribed and translated into viral proteins.
Verified step by step guidance1
Understand the lysogenic cycle: In the lysogenic cycle, the phage DNA integrates into the host's genome and remains dormant until it is triggered to enter the lytic cycle.
Identify the initial step in the lysogenic cycle: The phage DNA integrates into the bacterial chromosome, becoming a prophage.
Recognize the difference between lysogenic and lytic cycles: Unlike the lytic cycle, the lysogenic cycle does not immediately produce new phages or lyse the host cell.
Consider the role of the prophage: Once integrated, the prophage can be replicated along with the bacterial DNA during cell division, without harming the host.
Note the conditions for activation: The prophage may eventually be activated to enter the lytic cycle, where it will produce viral proteins and new phages, leading to cell lysis.
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