Which one of the following does not belong with the others?
a. Enterococcus
b. Lactobacillus
c. Staphylococcus
d. Streptococcus
e. All are grouped together.

Which of the following pairs is mismatched?

a. Anaerobic endospore-forming gram-positive rods—Clostridium

b. Facultatively anaerobic gram-negative rods—Escherichia

c. Facultatively anaerobic gram-negative rods—Shigella

d. Pleomorphic gram-positive rods—Corynebacterium

e. Spirochete—Helicobacter

When Legionella was newly discovered, why was it classified with the pseudomonads?

a. It is a pathogen.

b. It is an aerobic gram-negative rod.

c. It is difficult to culture.

d. It is found in water.

e. None of the above

These organisms are important in sewage treatment and can produce a fuel used for home heating and for generating electricity.

Which of the following terms is the most specific?

a. bacillus

b. Bacillus

c. gram-positive

d. endospore-forming rods and cocci

e. anaerobic

Which of the following is an intracellular parasite?

a. Rickettsia

b. Mycobacterium

c. Bacillus

d. Staphylococcus

e. Streptococcus

Spirillum is not classified as a spirochete because spirochetes

a. do not cause disease.

b. possess axial filaments.

c. possess flagella.

d. are prokaryotes.

e. none of the above