The correct statement is: SARS-CoV-1 requires a host cell to replicate, but Streptococcus pneumoniae can replicate independently.
To clarify:
- SARS-CoV-1 is a virus; viruses require a host cell to replicate and cannot replicate independently.
- Streptococcus pneumoniae is a bacterium; bacteria can replicate independently through cellular division.
Therefore, the other options provided are not accurate based on these characteristics.