You discover a new pathogen which you visualize using a light microscope. A negative stain reveals a clear halo around the cells. This suggests to you that the organism
A) is motile.
B) has a capsule.
C) is spherical in shape.
D) is Gram-positive.
E) has an LPS layer.

Question

Quizplus · Accepted Answer

The clear halo around cells indicates the presence of a capsule, which is a protective layer outside the cell wall.

You Discover a New Pathogen Which You Visualize Using a Light