Viruses were first identified:
A) because they caused an infection and formed colonies on nutrient agar plates.
B) because they were seen in the light microscope.
C) because they caused an infection and were small enough to pass through filters that trapped bacteria.
D) because they were smaller than bacteria and had all the properties of living organisms.
E) because they caused an infection and were seen in the electron microscope.

Question

Quizplus · Accepted Answer

Viruses were first identified because they caused infections and were small enough to pass through filters that trapped bacteria, indicating they were smaller than bacteria and could not be cultured like bacteria.

Viruses Were First Identified