For each of the following statements that is true, write “true” in the blank. For each statement that is false, write the word(s) that should be substituted for the underlined word(s) to make the statement correct.
__________ Most cyanobacteria form heterocysts in which nitrogen fixation occurs.

First label the following diseases as bacterial, viral, or protozoan, and then indicate which ones are vectorborne infections: dengue fever, AIDS, chikungunya, Lyme disease, malaria.

_____ Cooperation is common among microorganisms living in microhabitats.

Bacteria that convert nitrogen gas into ammonia are:

a. Nitrifying bacteria

b. Nitrogenous

c. Nitrogen fixers

d. Nitrification bacteria

In which type of symbiosis do both members benefit from their interaction?

a. Mutualism

b. Parasitism

c. Commensalism

d. Pathogenesis

List four types of symbiotic relationships, and give an example of each.