Question 1

Which of the following best describes the metabolic strategy of Cyanobacteria?

Accepted Answer

They perform oxygenic photosynthesis using $$2H_2O as an $$electron donor, producing $$O_2 as a $$byproduct.

Question 2

A patient presents with a rapidly progressing fever and a history of a tick bite. Laboratory tests reveal an obligate intracellular, Gram-negative bacterium. Which genus is most likely responsible?

Accepted Answer

Rickettsia

Question 3

Which of the following bacteria is known for forming concentric rings due to swarming motility and is a common cause of urinary tract infections?

Accepted Answer

Proteus mirabilis

Question 4

Which of the following is a distinguishing feature of Mycobacterium species?

Accepted Answer

A cell wall rich in mycolic acids, making them acid-fast.

Question 5

Which of the following statements about the genus Agrobacterium is correct?

Accepted Answer

It causes crown gall disease in plants by inserting a plasmid into plant cells.

Question 6

Which of the following bacteria is most likely to be found in hot springs and is the source of a thermostable DNA polymerase used in PCR?

Accepted Answer

Thermus aquaticus

Question 7

Which of the following best explains why many bacterial species remain undiscovered?

Accepted Answer

Many bacteria cannot be cultured in the laboratory because they require complex interactions with other microbes.

Question 8

Which of the following is true regarding the difference between Gram-positive and Gram-negative bacteria?

Accepted Answer

Gram-positive bacteria have a thicker peptidoglycan layer and may have high or low G+C content.

Question 9

Which of the following genera is responsible for the production of most clinically useful antibiotics and is characterized by branching filaments?

Accepted Answer

Streptomyces

Question 10

A Gram-negative, microaerophilic, helical bacterium is isolated from a patient with peptic ulcers. Which genus does this organism most likely belong to?

Accepted Answer

Helicobacter

Question 11

Which of the following bacteria is known for its extreme resistance to radiation due to a unique DNA arrangement?

Accepted Answer

Deinococcus radiodurans

Question 12

Which of the following is a characteristic of Chlamydia trachomatis?

Accepted Answer

It forms elementary bodies that are the infectious stage and lacks peptidoglycan in its cell wall.

Question 13

Which of the following best describes the ecological role of Bdellovibrio?

Accepted Answer

It is a predator of other Gram-negative bacteria, invading and consuming them from the inside.

Question 14

Which of the following bacteria is associated with the formation of biofilms in catheters and is highly resistant to antibiotics?

Accepted Answer

Pseudomonas aeruginosa

Question 15

Which of the following is true about methanogenic archaea?

Accepted Answer

They are strict anaerobes that produce methane as a metabolic byproduct.

Question 16

Which of the following bacteria is responsible for causing whooping cough?

Accepted Answer

Bordetella pertussis

Question 17

Which of the following is a feature of the Enterobacteriales order?

Accepted Answer

They are facultative anaerobes with peritrichous flagella and ferment carbohydrates.

Question 18

Which of the following bacteria is most likely to cause neonatal sepsis and meningitis?

Accepted Answer

Streptococcus agalactiae

Question 19

Which of the following is a unique feature of Sphaerotilus natans that aids in its survival in freshwater and sewage environments?

Accepted Answer

It forms sheaths around its cells for protection and nutrient gathering.

Question 20

Which of the following is true regarding the function of heterocysts in filamentous cyanobacteria?

Accepted Answer

They are specialized cells for nitrogen fixation.

Classification and Diversity of Prokaryotes: Domains Bacteria and Archaea

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