Which statement accurately describes viruses?

Viruses are indeed the smallest type of microorganisms, which makes this statement accurate. They are significantly smaller than bacteria and typically measure in nanometers rather than micrometers, the size range in which bacteria fall. This size distinction is a fundamental characteristic of viruses, affecting their classification and the methods required for detection and study.

The other options describe misconceptions about viruses. For example, viruses are not larger than bacteria; they are, in fact, much smaller. Additionally, they are not made up of multiple cells; viruses consist of a core of genetic material (either DNA or RNA) surrounded by a protein coat, and they are acellular, meaning they do not have a cellular structure. Lastly, while some viruses can withstand certain environmental stresses, they do not necessarily survive in extreme conditions the way some bacteria can, making this statement misleading. Understanding these characteristics is essential in the field of microbiology and infection control.