Use the drop-down menus to determine whether a bacterial example is beneficial or harmful to humans.

(beneficial) coriariaceae coriaria is a species of bacteria that convert nitrogen into a form usable by plants.

(harmful) mycobacterium tuberculosis is a species of bacteria that causes the disease tuberculosis in people.

(beneficial) lactobacillus acidophilus is a species of bacteria that is found in yogurt and can people improve their digestion.

(beneficial) lactobacillus sanfranciscensis is a species of bacteria that makes the sour flavor in sourdough bread. it gets its name from san francisco, where a great deal of sourdough bread is made.