Many bacteria exist in biofilms in nature. Based on the information in the passage and in the chapter, is it possible to create
a pure culture of a species that normally exists in biofilms? (A) Yes, because many species can have planktonic growth or live within a biofilm, and a biofilm can contain a single species.
(B) Yes, because bacteria are most commonly found in sessile forms and a biofilm contains sessile bacteria.
(C) No, because a pure culture by definition must grow in medium and would not be able to form a biofilm.
(D) No, because biofilms always contain many species of bacteria and a pure culture does not.
Crystal form refers to the geometric shape of mineral crystals. Crystal form is caused by the symmetrical, three-dimensional arrangement of atoms inside the mineral.
Eubacteria have the typical characteristics of a prokaryotic organism, but they also have the ability to form spores and can be pathogenic organisms (like causes disease in humans and animals).
