54) The suspension of virus has a concentration of 250 ng/uL. What would be the concentration in the third test tube?

A. 25 ng/ul B. 2.5 ng/uL C. 0.25 ng/uL D. 0.025 ng/uL

why is the answer C? thank you

I don't have a clue on the three tubes, however, if the concentration was diluted by 1000, C is the right answer.

To find the concentration in the third test tube, we need more information. The information provided only states the concentration of the virus suspension in general, not the individual concentrations in each test tube.

If you have additional information about the dilution or dilution factor in each test tube, please provide it so that we can calculate the concentration in the third test tube. Without that information, it is not possible to determine the concentration in the third test tube or explain why the answer is option C.