Multiple Choice
Viruses typically attach to what type of host membrane receptors?
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17. Viruses
Viruses
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Which of the following could trigger the lytic cycle of a bacteriophage?
A
Entry into the lysogenic cycle
B
Exposure to ultraviolet light
C
Integration into the host genome
D
Formation of a prophage
Verified step by step guidance1
Understand the difference between the lytic and lysogenic cycles. The lytic cycle involves the replication of the bacteriophage and destruction of the host cell, while the lysogenic cycle involves integration of the bacteriophage DNA into the host genome without immediate destruction.
Recognize that certain environmental factors can trigger the switch from the lysogenic cycle to the lytic cycle. This switch is often due to stress conditions that affect the host cell.
Identify ultraviolet (UV) light as a common environmental stressor. UV light can cause damage to the host cell's DNA, leading to the activation of the lytic cycle.
Consider how the integration into the host genome and formation of a prophage are part of the lysogenic cycle, where the bacteriophage DNA is dormant within the host genome.
Conclude that exposure to ultraviolet light is the factor that can trigger the lytic cycle, as it induces stress and potential damage to the host cell, prompting the bacteriophage to enter the lytic cycle.
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