Question

why are viruses harmful to host cells? 1. at the end of viral replication, the virus often kills the host cell. 2. the viruses use the host cells nutrients and energy for viral replication. 3. viruses cause the host cell to attack healthy cells. 1, 2, and 3 3 only 2 only 1 and 2 only

Explanation:

1. Viral replication (e.g., lytic cycle) typically ends with the host cell lysing and dying, harming the host.
2. Viruses lack their own metabolic machinery, so they hijack the host cell's nutrients and energy for replication, depleting the host cell's resources.
3. Viruses do not cause host cells to attack healthy cells; this is not a mechanism of viral harm.

Answer:

1 and 2 only