Question 1

Which of the following best describes the main metabolic characteristic of Proteobacteria?

Accepted Answer

They are chemoheterotrophic and Gram-negative.

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 equations correctly represents the oxidation of ammonia by Nitrosomonas?

Accepted Answer

$$2NH_4^+ \rightarrow 2NO_2^-$$

Question 4

Which bacterium is responsible for causing crown gall disease in plants by inserting a plasmid into plant cells?

Accepted Answer

Agrobacterium

Question 5

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

Accepted Answer

They lack a cell wall and are pleomorphic.

Question 6

A laboratory is attempting to identify a bacterium that cannot be cultured. Which molecular technique would be most appropriate?

Accepted Answer

Polymerase Chain Reaction (PCR)

Question 7

Which of the following bacteria is most likely to be found in the intestines and is used as an indicator of fecal contamination?

Accepted Answer

Escherichia coli

Question 8

Which group of bacteria is known for producing most commercially important antibiotics?

Accepted Answer

Streptomyces

Question 9

Which of the following best describes the photosynthetic process in cyanobacteria?

Accepted Answer

$$CO_2 + 2H_2O$$ \xrightarrow{light} (CH_2O) + H_2O + $$O_2$$

Question 10

Which of the following is a characteristic of Deinococcus radiodurans?

Accepted Answer

It is highly resistant to radiation.

Question 11

A patient develops a severe cough and is diagnosed with whooping cough. Which bacterium is responsible?

Accepted Answer

Bordetella pertussis

Question 12

Which of the following bacteria is associated with the formation of concentric rings due to swarming motility?

Accepted Answer

Proteus mirabilis

Question 13

Which of the following archaea would most likely be found in a solar evaporating pond?

Accepted Answer

Halobacteria

Question 14

Which of the following bacteria is responsible for causing peptic ulcers and has multiple flagella?

Accepted Answer

Helicobacter pylori

Question 15

Which of the following is true about the genus Clostridium?

Accepted Answer

They are endospore-producing obligate anaerobes.

Question 16

Which of the following bacteria is known for its resistance to antibiotics and is a common cause of nosocomial infections?

Accepted Answer

Acinetobacter baumannii

Question 17

Which of the following is a unique feature of Gemmata obscuriglobus among prokaryotes?

Accepted Answer

It has a membrane around its DNA, resembling a eukaryotic nucleus.

Question 18

Which of the following bacteria is responsible for cat-scratch disease?

Accepted Answer

Bartonella henselae

Question 19

Which of the following is a function of heterocysts in cyanobacteria?

Accepted Answer

Nitrogen fixation

Study Guide: The Prokaryotes – Domains Bacteria and Archaea (Microbiology Chapter 11)

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