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Chapter 11

front 1

1) Which of the following are found primarily in the intestines of humans?

A) gram-negative aerobic rods and cocci

B) aerobic, helical bacteria

C) facultatively anaerobic gram-negative rods

D) gram-positive cocci

E) endospore-forming rods

back 1

Answer: C

front 2

What is group "c." in the key shown in Figure 11.1?

A) bacteroidetes

B) chlamydiae

C) fusobacteria

D) planctomycetes

E) spirochaetes

back 2

Answer: E

front 3

3) Which of the following is NOT a characteristic inherent of the non-endospore-forming gram-positive rods?

A) are aerotolerant

B) carry out fermentative metabolism

C) display a branched filamentous morphology

D) nonpathogenic

E) lack cell walls

back 3

Answer: D

front 4

4) Which of the following is NOT a characteristic of Neisseria?

A) requires X and V factors

B) cocci

C) gram-negative

D) oxidase-positive

E) Some species are human pathogens.

back 4

Answer: A

front 5

5) Staphylococcus and Streptococcus can be easily differentiated in a laboratory by which one of the following?

A) cell shape

B) Gram stain reaction

C) growth in high salt concentrations

D) ability to cause disease

E) glucose fermentation

back 5

Answer: C

front 6

6) Which of the following genera is an anaerobic gram-negative rod?

A) Escherichia

B) Staphylococcus

C) Bacteroides

D) Treponema

E) Neisseria

back 6

Answer: C

front 7

7) Which of the following do you expect to be MOST resistant to high temperatures?

A) Bacillus subtilis

B) Eschericia coli

C) Neisseria gonorrhoeae

D) Staphylococcus aureus

E) Streptococcocus pyogenes

back 7

Answer: A

front 8

8) Which of the following is NOT an enteric?

A) Salmonella

B) Shigella

C) Escherichia

D) Enterobacter

E) Campylobacter

back 8

Answer: E

front 9

9) Which of the following is NOT a characteristic of spirochetes?

A) possess an axial filament

B) gram-negative

C) helical shape

D) easily observed with brightfield microscopy

E) found in the human oral cavity

back 9

Answer: D

front 10

10) You have isolated a bacterium that grows in a medium containing an organic substrate and nitrate in the absence of oxygen. The nitrate is reduced to nitrogen gas. You can be sure that this bacterium is

A) gram-positive.

B) using anaerobic respiration.

C) a chemoautotroph.

D) a photoautotroph.

E) a photoheterotroph.

back 10

Answer: B

front 11

11) Which of the following lacks a cell wall?

A) Borrelia

B) Mycoplasma

C) Mycobacterium

D) Clostridium

E) Nocardia

back 11

Answer: B

front 12

12) Which of the following bacteria is gram-negative?

A) Treponema

B) Corynebacterium

C) Bacillus

D) Staphylococcus

E) Mycobacterium

back 12

Answer: A

front 13

13) Which of the following form conidiospores?

A) endospore-forming gram-positive rods and cocci

B) actinomycetes and related organisms

C) rickettsias

D) anaerobic gram-negative cocci

E) spiral and curved bacteria

back 13

Answer: B

front 14

14) Which of the following pairs is mismatched?

A) dissimilatory sulfate-reducing bacteria — produce H2S

B) archaea — extremophiles

C) chemoautotrophic bacteria — fix atmospheric nitrogen

D) actinomycetes — reproduce by fragmentation

E) Cytophaga — a gliding, nonfruiting bacterium

back 14

Answer: C

front 15

15) Rickettsias differ from chlamydias in that rickettsias

A) are gram-negative.

B) are intracellular parasites.

C) require an arthropod for transmission.

D) form elementary bodies.

E) are enterics.

back 15

Answer: C

front 16

16) Requirements for X and V factors are used to identify

A) Staphylococcus.

B) Escherichia.

C) Neisseria.

D) Haemophilus.

E) Pseudomonas.

back 16

Answer: D

front 17

17) You have isolated a bacterium that grows in a medium containing only inorganic nutrients. Ammonia is oxidized to a nitrate ion. This bacterium is

A) gram-negative.

B) using anaerobic respiration.

C) a chemoautotroph.

D) a photoautotroph.

E) a photoheterotroph.

back 17

Answer: C

front 18

18) Which of the following bacteria is gram-positive?

A) Pseudomonas

B) Salmonella

C) Streptococcus

D) Bacteroides

E) Rickettsia

back 18

Answer: C

front 19

19) Escherichia coli belongs to the

A) proteobacteria.

B) gram-positive bacteria.

C) green sulfur bacteria.

D) spirochetes.

E) actinomycetes.

back 19

Answer: A

front 20

20) Which one of the following bacteria does NOT belong with the others?

A) Bacillus

B) Escherichia

C) Lactobacillus

D) Staphylococcus

E) Streptococcus

back 20

Answer: B

front 21

21) Which of the following statements about the causative agent of Rocky Mountain spotted fever is FALSE?

A) It is an intracellular parasite.

B) It is transmitted by ticks.

C) It is in the genus Rickettsia.

D) It is gram-negative.

E) It is found in soil and water.

back 21

Answer: E

front 22

22) A primary difference between cyanobacteria and purple and green phototrophic bacteria is

A) energy source.

B) cell wall type.

C) electron donor for CO2

D) cell type.

E) color.

back 22

Answer: C

front 23

23) Which one of the following bacteria does NOT belong with the others?

A) Bordetella

B) Burkholderia

C) Neisseria

D) Acidithiobacillus

E) Salmonella

back 23

Answer: E

front 24

24) Which of the following bacteria are responsible for more infections and more different kinds of infections?

A) Streptococcus

B) Staphylococcus

C) Salmonella

D) Pseudomonas

E) Neisseria

back 24

Answer: A

front 25

25) Both Beggiatoa and the purple sulfur bacteria use H2S. These bacteria differ in that Beggiatoa

A) uses H2S for an energy source.

B) uses H2S for a carbon source.

C) uses light energy.

D) belongs to the gammaproteobacteria.

E) is a heterotroph.

back 25

Answer: A

front 26

26) The nonsulfur photosynthetic bacteria use organic compounds as

A) carbon sources.

B) electron donors to reduce CO2.

C) energy sources.

D) electron acceptors.

E) oxygen sources.

back 26

Answer: B

front 27

27) Which of the following is the best reason to classify Streptococcus in the Lactobacillales?

A) Gram reaction

B) morphology

C) fermentation of lactose

D) rRNA sequences

E) found in dairy products

back 27

Answer: D

front 28

28) Streptomyces differs from Actinomyces because Streptomyces

A) makes antibiotics.

B) produces conidia.

C) forms filaments.

D) is a strict aerobe.

E) is a bacterium.

back 28

Answer: D

front 29

29) All of the following bacteria are gram-positive. Which does NOT belong with the others?

A) Actinomyces

B) Gardnerella

C) Corynebacterium

D) Listeria

E) Mycobacterium

back 29

Answer: D

front 30

30) Salmonella, Shigella, Yersinia, and Serratia are all

A) pathogens.

B) gram-negative facultatively anaerobic rods.

C) gram-positive aerobic cocci.

D) fermentative.

E) endospore-forming bacteria.

back 30

Answer: B

front 31

31) You have isolated a gram-positive rod. What should you do next?

A) Gram stain

B) lactose fermentation

C) endospore stain

D) flagella stain

E) enterotube

back 31

Answer: C

front 32

32) Borrelia is classified as a spirochete because it

A) is aerobic.

B) possesses an axial filament.

C) is a rod.

D) is a pathogen.

E) is transmitted by ticks.

back 32

Answer: B

front 33

33) Thiobacillus oxidizes inorganic sulfur compounds and reduces CO2. This bacterium is a

A) chemoheterotroph.

B) chemoautotroph.

C) photoautotroph.

D) gammaproteobacteria.

E) photoheterotroph.

back 33

Answer: B

front 34

34) You have isolated a prokaryotic cell. The first step in identification is a(n)

A) Gram stain.

B) lactose fermentation test.

C) endospore stain.

D) flagella stain.

E) DNA fingerprint.

back 34

Answer: A

front 35

35) Actinomycetes differ from fungi in that actinomycetes

A) are chemoheterotrophs.

B) lack a membrane-bounded nucleus.

C) require light.

D) are decomposers.

E) cause disease.

back 35

Answer: B

front 36

36) You have isolated an aerobic gram-positive, endospore-forming bacterium that grows well on nutrient agar. To which of the following groups does it most likely belong?

A) phototrophic bacteria

B) gammaproteobacteria

C) deltaproteobacteria

D) bacillales

E) The answer cannot be determined based on the information provided.

back 36

Answer: D

front 37

37) Which of the following pairs is mismatched?

A) spirochete — axial filament

B) aerobic, helical bacteria — gram-negative

C) enterics — gram-negative

D) mycobacteria — acid-fast

E) Pseudomonas — gram-positive

back 37

Answer: E

front 38

38) Which one of the following does NOT belong with the others?

A) Coxiella

B) Ehrlichia

C) Rickettsia

D) Staphylococcus

E) Wolbachia

back 38

Answer: D

front 39

39) Caulobacter are different from most bacteria in that they

A) are gram-negative.

B) are gram-positive.

C) have stalks.

D) lack cell walls.

E) are motile.

back 39

Answer: C

front 40

40) All of the following bacteria are motile. Which does NOT have flagella?

A) Escherichia

B) helical bacteria

C) Pseudomonas

D) spirochetes

E) Salmonella

back 40

Answer: D

front 41

41) Which of the following bacteria does NOT belong with the others?

A) Halobacterium

B) Halococcus

C) Methanobacterium

D) Staphylococcus

E) Sulfolobus

back 41

Answer: D

front 42

42) Mycoplasmas differ from other bacteria in that they

A) grow inside host cells.

B) lack a cell wall.

C) are acid-fast.

D) are motile.

E) are gram-negative.

back 42

Answer: B

front 43

43) Which of the following pairs is NOT correctly matched?

A) elementary body — Escherichia

B) endospore — Bacillus

C) endospore — Clostridium

D) heterocyst — cyanobacteria

E) myxospore — gliding bacteria

back 43

Answer: A

front 44

44) Burkholderia was reclassified from the gammaproteobacteria to the betaproteobacteria because

A) it grows in disinfectants.

B) it is a gram-negative rod.

C) it causes infections in cystic fibrosis patients.

D) it causes melioidosis.

E) its rRNA sequence is similar to that of Neisseria.

back 44

Answer: E

front 45

45) The crab industry needs female crabs for growing more crabs. What bacterium might be used to ensure development of female crabs and shrimp?

A) Acinetobacter

B) Gemmata

C) Neisseria

D) Pelagibacter

E) Wolbachia

back 45

Answer: E