Question

viruses have structures that allow them to inject their genetic material directly into the dna of the host cell. this strategy benefits the virus in that - it is able to transform into a host cell. the virus uses the hosts machinery to replicate. the host cell is turned into a virus. mutations are introduced into the host cell.

Explanation:

Viruses are non - living entities that need a host cell to replicate. When a virus injects its genetic material into the host cell's DNA, it takes over the host's cellular machinery (such as ribosomes for protein synthesis, enzymes for DNA replication etc.). The host cell then unknowingly uses its own resources to replicate the virus's genetic material and produce viral proteins, which are then assembled into new virus particles.

• The first option “it is able to transform into a host cell” is incorrect because a virus cannot transform into a host cell. A virus has a different structure (e.g., lacks organelles like a host cell has) and function.
• The third option “the host cell is turned into a virus” is wrong. The host cell does not become a virus. Instead, it is used to produce multiple virus particles.
• The fourth option “mutations are introduced into the host cell” is not the main benefit for the virus. While mutations can occur (e.g., due to error - prone replication of viral genetic material in some cases), the primary benefit for the virus is replication.

Answer:

the virus uses the host’s machinery to replicate.