a virus that is found in a low-density population of host bacteria deep in the ocean Virus generally enter lysogenic pathway when the host cell density is less or the host cell faces adverse environmental conditions. When favourable conditions regain and the host cells enter log phase of growth, or when the cell density is high, the virus activates lytic cycle. Solution a virus that is found in a low-density population of host bacteria deep in the ocean Virus generally enter lysogenic pathway when the host cell density is less or the host cell faces adverse environmental conditions. When favourable conditions regain and the host cells enter log phase of growth, or when the cell density is high, the virus activates lytic cycle..