Question

what is a biofilm?
a non - living material that bacteria live on
a mobile bacteria cell moving in its environment
a community of bacteria living on a surface
a single bacterial cell living on a surface

Explanation:

A biofilm is a community of microorganisms (usually bacteria) that adhere to a surface and are embedded in a self - produced matrix of extracellular polymeric substances. Option A describes a single bacterial cell, not a biofilm. Option B describes a motile (mobile) bacterial cell moving, not a biofilm. Option D describes a non - living material with bacteria, not a biofilm. Option C correctly describes a community of bacteria living on a surface, which matches the definition of a biofilm.

Answer:

C. A community of bacteria living on a surface