If reasonably pure preparations of virus are available, the number of virus present may be determined by
A) photocolorimetry.
B) electron microscopy.
C) gas chromatography.
D) light microscopy.
E) spectrophotometry.

Question

Quizplus · Accepted Answer

Electron microscopy allows for the direct visualization of viruses, enabling the determination of the number of virus particles present in a sample. This is because viruses are too small to be seen with light microscopy but can be observed with the higher resolution of electron microscopy.

If Reasonably Pure Preparations of Virus Are Available, the Number