The development of which of the following instruments or techniques in the 1930's allowed scientists to visualize viral particles for the first time?

Question

Quizplus · Accepted Answer

The electron microscope was developed in the 1930's and allowed scientists to visualize viral particles for the first time. Polymerase chain reaction (PCR), confocal microscopy, thermal cyclers, and plaque assays were all developed later, with PCR not being invented until the 1980's.

The Development of Which of the Following Instruments or Techniques