Question 1

Which of the following statements best describes the metabolic diversity of the Gammaproteobacteria genus Pseudomonas?

Accepted Answer

They are metabolically diverse, can use a wide range of organic compounds, and are opportunistic pathogens.

Question 2

Which bacterial genus is responsible for crown gall disease in plants by inserting a plasmid into plant cells, causing tumor formation?

Accepted Answer

Agrobacterium

Question 3

A patient presents with symptoms of Rocky Mountain spotted fever. Which organism is most likely responsible, and how is it transmitted?

Accepted Answer

Rickettsia rickettsii, transmitted by tick bites

Question 4

Which of the following bacteria is known for its ability to fix nitrogen in association with the roots of leguminous plants?

Accepted Answer

Rhizobium

Question 5

Which group of bacteria is characterized by the absence of peptidoglycan in their cell wall and an obligate intracellular lifestyle?

Accepted Answer

Chlamydiae

Question 6

Which genus of bacteria is responsible for the production of many antibiotics and is commonly isolated from soil?

Accepted Answer

Streptomyces

Question 7

Which of the following bacteria is a major indicator of fecal contamination in water and can cause foodborne disease?

Accepted Answer

Escherichia coli

Question 8

Which bacterial genus is known for its swarming motility and formation of concentric rings on agar plates?

Accepted Answer

Proteus

Question 9

Which of the following is true about cyanobacteria?

Accepted Answer

They carry out oxygenic photosynthesis and can fix nitrogen in heterocysts.

Question 10

Which genus of bacteria is responsible for causing peptic ulcers and stomach cancer, and what is its oxygen requirement?

Accepted Answer

Helicobacter; microaerophilic

Question 11

Which of the following bacteria is known for its resistance to radiation due to a unique arrangement of DNA that facilitates rapid repair?

Accepted Answer

Deinococcus radiodurans

Question 12

Which group of bacteria is divided based on their G+C content, and what is the typical G+C ratio for Streptococcus?

Accepted Answer

Gram-positive bacteria; 33–44%

Question 13

Which genus of bacteria is an obligate intracellular parasite, forms an elementary body, and causes trachoma?

Accepted Answer

Chlamydia

Question 14

Which of the following bacteria is a major cause of neonatal sepsis and meningitis, and is beta-hemolytic?

Accepted Answer

Streptococcus agalactiae

Question 15

Which genus of bacteria is known for its lack of a cell wall, pleomorphic shape, and ability to cause mild pneumonia?

Accepted Answer

Mycoplasma

Question 16

Which genus of bacteria is an obligate parasite of mammals, survives phagocytosis, and causes brucellosis?

Accepted Answer

Brucella

Question 17

Which group of bacteria is known for moving via axial filaments, creating a corkscrew type of motility, and includes the causative agent of syphilis?

Accepted Answer

Spirochaetes

Question 18

Which genus of bacteria is found in anaerobic sediments and intestinal tracts, and uses sulfate instead of oxygen as a final electron acceptor?

Accepted Answer

Desulfovibrio

Question 19

Which genus of bacteria is a pathogen of domestic animals and can be transmitted to humans via animal bites?

Accepted Answer

Pasteurella

Question 20

Which group of Archaea is known for producing methane and can be found in the human colon, vagina, and mouth?

Accepted Answer

Methanogens

Classification and Diversity of Prokaryotes: Domains Bacteria and Archaea

Study Guide - Practice Questions