Microbiology: A Systems Approach 4th Edition by Marjorie Kelly Cowan

Exercise 38

Critical thinking is the ability to reason and solve problems using facts and concepts. These questions can be approached from a number of angles and, in most cases, they do not have a single correct answer.
You are a scientist viewing a Gram-stained slide of a bacterial culture obtained from a patient. You note purple spherical cells that are attached to one another in groups of four. Make a sketch of this bacterium; using proper terminology from this chapter, describe the morphology and arrangement of this bacterium as well as its cell wall composition.