7. in the cycle, a virus integrates its dna into the host's dna, and its dna is replicated when the host dna is replicated. a. infectious b. retroviral c. lysogenic d. lytic

Its lysogenic cycle if a virus integrates its DNA into host cell.

Explanation:

Bacteriophages are the viruses which infect bacteria. Viruses are obligatory parasites which need host for their survival. Viruses which infect bacteria can either take up the lytic cycle or lysogenic cycle. Lytic as the name suggests involves the lysis of host bacterial cell after the replication of virus. Once the bacterial cell is lysed and the virions are released they invade another host bacterial cell. In the other case i.e. lysogenic cycle, the bacteriophage after infecting the host bacterial cell integrates its genome into the host cell genome. At this stage we call it as prophage. The viral genome gets replicated with the host cell machinery but does not produces the viral protein and remains dormant with in the host cell. The integrated genome of virus is passed on to the daughter cells as the cell division occurs. Once the bacterial host cell condition becomes progressively worse, the reproductive cycle of virus begins resulting in the lysis of host cell.

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error