Compared to bacteria that have a typical size range between 1-10 μm,
Select one:

a. Viruses have a much greater size range; between 22 nm and 1000 nm
b. All viruses are 22 nm
c. Viruses range in size between 20-200 nm and are much larger than bacterial cells
d. Viruses are larger and are blocked by sterilizing filters

Explanation: Firstly, viruses are usually much smaller than bacteria. Their cellular structure is much smaller and less complex than that of a bacteria, allowing them to invade bacterial species and use them as hosts for reproduction. Therefore, choices c and d are automatically ruled out since viruses are smaller than bacteria, not larger.

Choice B can be ruled out as well because viruses, like all biological organisms, vary in size. Not all viruses are 22nm in diameter, as viruses can vary wildly in size. Some, like the Zika virus, are relatively small at 50 nm in diameter. Others, such as the Giant Mimivirus, can reach up to 500 nm in size, being extremely large for a virus. Thus, choice a is the best answer choice.