The cell shown is found in the human stomach and is now known to cause peptic ulcers. What is the name of this bacterium?

Figure 4.28 (credit: American Society for Microbiology)

The microscopic growth pattern shown is characteristic of which genus of bacteria?

Figure 4.29 (credit: modification of work by Janice Haney Carr/Centers for Disease Control and Prevention)

What is the connection between this methane bog and archaea?

Figure 4.30 (credit: Chad Skeers)