Which Type of Pathogen is a Microscopic Living Organism That

Question

Which type of pathogen is a microscopic living organism that does not have a nucleus?
A) bacterium
B) virus
C) prion
D) protozoon

Accepted Answer

Bacteria are microscopic living organisms that lack a nucleus and come in a variety of shapes.

Answer: B) virus 
 Viruses are not always considered living organisms, but they are microscopic and do not have a nucleus.

Answer: D) protozoon 
 Protozoa are a type of microscopic living organism that do have a nucleus.

Answer: C) prion 
 Prions are not living organisms, but rather misfolded proteins that can cause disease. They do not have a nucleus.