Plasma from a sick mouse is filtered across a membrane that has a 200 nm pore size.If the filtrate is still infectious when injected into a healthy mouse,then the pathogen is most likely a(n):
A)bacterium
B)archaean
C)fungus
D)virus
E)parasitic worm

Question

Quizplus · Accepted Answer

Viruses are smaller than bacteria, archaean, and fungi and can pass through a 200 nm pore size membrane, which indicates that the infective agent is most likely a virus. Parasitic worms are larger than 200 nm and would not pass through this size pore.

Plasma from a Sick Mouse Is Filtered Across a Membrane