Created by
Paul A. Gulig, Ph.D.
Department of Molecular Genetics and Microbiology
with assistance from
David Brumbaugh
What is the significance of the two colony types?
D. Type 2 is gram-positive, and type 1 is gram-negative.
No, the color of the colonies has nothing to do with Gram staining characteristics. But because these bacteria even grew on the MacConkey plate means they most likely are gram-negative rods. You should know why this is true!