Question 1

Which of the following phyla contains the largest number of characterized bacterial genera and species, and is also the most metabolically diverse?

Accepted Answer

Proteobacteria

Question 2

A plant root nodule is shown in the image. Which genus of Alphaproteobacteria is primarily responsible for nitrogen fixation in these nodules?

Accepted Answer

Rhizobium

Question 3

Which of the following best describes the metabolic strategy of Propionibacterium in Swiss cheese production?

Accepted Answer

Secondary fermentation of lactic acid

Question 4

A patient presents with a rapidly progressing, necrotic wound after a traumatic injury. Which genus of Firmicutes is most likely responsible for this condition?

Accepted Answer

Clostridium

Question 5

Which of the following statements about Mycoplasma is correct?

Accepted Answer

They are among the smallest organisms capable of autonomous growth.

Question 6

Which of the following genera is a common cause of urinary tract infections and is known for its swarming motility on agar plates?

Accepted Answer

Proteus

Question 7

Which of the following is a distinguishing feature of the genus Deinococcus?

Accepted Answer

Resistance to UV and gamma radiation

Question 8

A Gram-negative, oxidase-positive, curved rod is isolated from a patient with severe gastroenteritis after eating raw oysters. Which genus is most likely responsible?

Accepted Answer

Vibrio

Question 9

Which of the following best explains why Mycobacterium tuberculosis is acid-fast?

Accepted Answer

It has a high surface lipid content.

Question 10

Which of the following is a key ecological role of Bacteroides in the human intestinal tract?

Accepted Answer

Synthesizing sphingolipids

Question 11

Which of the following genera is known for producing a large number of antibiotics and is responsible for the earthy odor of soil?

Accepted Answer

Streptomyces

Question 12

A patient is diagnosed with peptic ulcers. Which genus of Epsilonproteobacteria is most likely involved?

Accepted Answer

Helicobacter

Question 13

Which of the following best describes the fermentation pathway of Escherichia coli?

Accepted Answer

Mixed-acid fermentation

Question 14

Which genus is an obligate intracellular parasite and the causative agent of diseases such as typhus and Rocky Mountain spotted fever?

Accepted Answer

Rickettsia

Question 15

Which of the following genera is used as a biological control agent by sterilizing male mosquitoes?

Accepted Answer

Wolbachia

Question 16

Which of the following is a characteristic of the genus Planctomyces?

Accepted Answer

Stalked, aquatic bacteria with membrane-enclosed nuclear structure

Question 17

Which of the following genera is most likely to be found in high-temperature environments and has genes likely originated from Archaea?

Accepted Answer

Thermotoga

Question 18

Which genus is responsible for the formation of crown gall tumors in plants by inserting a plasmid into plant cells?

Accepted Answer

Agrobacterium

Question 19

Which of the following best describes the oxygen relationship of Staphylococcus species?

Accepted Answer

Facultative aerobes

Question 20

Which of the following genera is a Gram-negative, obligately anaerobic bacterium that is numerically dominant in the human intestinal tract?

Accepted Answer

Bacteroides

Diversity and Phylogeny of Bacteria: Major Groups and Their Characteristics

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