Questions: In which reproductive cycle of the virus does the viral DNA integrates with the host DNA? Apoptosis Cycle Life Cycle Lytic Cycle Lysogenic cycle

The answer is the fourth one (D): Lysogenic cycle.

Explanation for each option:

1. Apoptosis Cycle: This is not a viral reproductive cycle. Apoptosis refers to the process of programmed cell death in multicellular organisms, not a method of viral reproduction.

2. Life Cycle: This is a general term that can refer to the entire process of a virus's existence, including both the lytic and lysogenic cycles. It does not specifically refer to the integration of viral DNA with host DNA.

3. Lytic Cycle: In the lytic cycle, the virus takes over the host cell's machinery to replicate its own components, leading to the destruction of the host cell. The viral DNA does not integrate with the host DNA in this cycle.

4. Lysogenic Cycle: In the lysogenic cycle, the viral DNA integrates into the host cell's DNA and can remain dormant for a period of time. This integrated viral DNA is known as a prophage. The lysogenic cycle is characterized by this integration process.

In summary, the lysogenic cycle is the reproductive cycle in which the viral DNA integrates with the host DNA.