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Indicate whether the statement is true or false: Many chronic medical conditions have been found to be associated with microbial agents.

• True

• False

Indicate whether the statement is true or false: All bacteria and archaea are microorganisms, but only some eukaryotes are microorganisms.

• True

• False

Indicate whether the statement is true or false: Members of the same species share many more characteristics compared to those shared by members of the same kingdom.

• True

• False

Indicate whether the statement is true or false: The names of the three proposed domains are Bacteria, Protista, and Eukarya.

• True

• False

Indicate whether the statement is true or false: The scientific method involves formulating a tentative explanation, called the hypothesis, to account for what has been observed or measured.

• True

• False

Indicate whether the statement is true or false: A hypothesis must be tested many times before it can be considered a theory.

• True

• False

MULTIPLE CHOICE - Choose the one alternative that best completes the statement or answers the question. Microorganisms are best defined as organisms that ______.

• cause human disease

• lack a cell nucleus

• are infectious particles

• are too small to be seen with the unaided eye

• can only be found growing in laboratories

MULTIPLE CHOICE - Choose the one alternative that best completes the statement or answers the question. Which of the following are not considered microorganisms?

• Mosquitoes

• Protozoa

• Bacteria

• Viruses

• Fungi

MULTIPLE CHOICE - Choose the one alternative that best completes the statement or answers the question. Among these types of microorganisms, the ______ are noncellular.

• viruses

• helminths

• protozoans

• bacteria

MULTIPLE CHOICE - Choose the one alternative that best completes the statement or answers the question. Helminths are ______.

• bacteria

• protozoa

• molds

• parasitic worms

• infectious particles