Final answer:
The phage is considered verified if the eye symbol does not have a slash through it. In the context of phage biology, the lytic cycle involves the infection and destruction of bacterial cells with the release of new phages, while the lysogenic cycle involves the dormant integration of phage DNA into the host genome.
Step-by-step explanation:
If the eye symbol at the left of the phage line does not have a "/" through it, the phage is verified. This symbol typically indicates verification status in various contexts, and can often be interpreted as such when dealing with scientific diagrams or databases. In terms of phage biology, the phage infects the cell during the lytic cycle, with infection characterized by the production and release of new phages into the environment, potentially after the replication of phage DNA and destruction of the bacterial cell.
When bacteria are infected with a phage, researchers may track whether viral DNA or protein enters the host cell using labeling methods such as with radioactive isotopes like 32P (phosphorus) for DNA and 35S (sulfur) for proteins. For instance, if bacteria infected with phage containing 32P-labeled DNA produced 32P-labeled phage, this result would imply that viral DNA is involved in the formation of new phage particles during infection.
The lysogenic cycle differs from the lytic cycle as it involves the integration of phage DNA into the host genome. This can remain dormant until activation by certain triggers, such as environmental stressors, which could initiate the lytic cycle. However, bacterial lysis, the process of cell destruction, is generally associated only with the lytic cycle.