Which of the following is true regarding viruses?

Viruses are indeed smaller than bacteria, which makes the statement accurate. Viruses typically range from about 20 to 300 nanometers in size, whereas bacteria are generally larger, ranging from about 1 to 10 micrometers. This size difference is important in microbiology as it affects how each type of microorganism interacts with its environment and how it can be observed under a microscope.

The other statements do not hold true. Viruses require a host cell to duplicate; they cannot replicate independently outside of a living organism. Nystatin, which is an antifungal medication, is designed to target fungal cells and does not have any effect on viruses. Additionally, while some viruses do replicate their RNA, not all do; some viruses replicate using DNA or utilize reverse transcription. Therefore, the assertion that they only reproduce by RNA replication is not accurate.