Question 1

Which of the following statements best explains why endospores are a concern for food processors and health care professionals?

Accepted Answer

Endospores can survive harsh conditions, including heat and chemicals, making them difficult to eliminate.

Question 2

A microbiologist observes a prokaryotic cell dividing by binary fission. Which equation best describes the number of cells after $$n$$ generations, starting from a single cell?

Accepted Answer

$$N = 2^n$$

Question 3

Which of the following is a unique reproductive strategy observed in Epulopiscium and its relatives?

Accepted Answer

Viviparity, where live offspring emerge from the body of the dead mother cell

Question 4

Which feature distinguishes archaea from bacteria?

Accepted Answer

Archaea have cell membrane lipids with branched hydrocarbon chains.

Question 5

A scientist isolates a microorganism from a hot spring with a temperature of $$90^{\circ}C$. Which group is this organism most likely to belong to?

Accepted Answer

Hyperthermophilic archaea

Question 6

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

Accepted Answer

They convert carbon dioxide, hydrogen gas, and organic acids into methane gas.

Question 7

Cyanobacteria are significant in Earth's history because they:

Accepted Answer

Transformed the anaerobic atmosphere into an oxygen-containing atmosphere through photosynthesis.

Question 8

Which of the following bacteria is most likely to contaminate refrigerated dairy products and can cross the placenta in pregnant women?

Accepted Answer

Listeria monocytogenes

Question 9

A patient presents with severe diarrhea after antibiotic treatment. Which bacterium is most likely responsible?

Accepted Answer

Clostridium difficile

Question 10

Which equation best represents the oxidation of ammonia ($$NH_3) to $$nitrite ($$NO_2$$^-$$) by nitrifying bacteria?

Accepted Answer

$$NH_3$$ + $$O_2$$ \rightarrow $$NO_2^- + H_2O$

Question 11

Which of the following is a characteristic of Mycoplasmas?

Accepted Answer

They lack cell walls and are the smallest free-living cells.

Question 12

A farmer uses Bacillus thuringiensis to protect crops. What is the mechanism of action of this bacterium?

Accepted Answer

It produces a toxin that acts as an insecticide.

Question 13

Which of the following bacteria is most likely to cause 'walking pneumonia'?

Accepted Answer

Mycoplasma pneumoniae

Question 14

Which genus of bacteria is known for forming branching filaments resembling fungi and is important in immunocompromised patients?

Accepted Answer

Actinomycetes

Question 15

A plant root nodule is observed to contain bacteria that convert atmospheric nitrogen ($$N_2) to $$ammonia ($$NH_3). $$Which genera are most likely responsible?

Accepted Answer

Azospirillum and Rhizobium

Question 16

Which of the following bacteria is transmitted through the bite of an arthropod and causes several human diseases?

Accepted Answer

Rickettsia

Question 17

A patient with cystic fibrosis is at increased risk for respiratory infections by which betaproteobacterium?

Accepted Answer

Burkholderia

Question 18

Which of the following bacteria is responsible for causing ulcers in humans?

Accepted Answer

Helicobacter pylori

Question 19

Which equation best represents the conversion of carbon dioxide ($$CO_2) $$and hydrogen gas ($$H_2) to $$methane ($$CH_4) by $$methanogens?

Accepted Answer

$$CO_2 + 4H_2$$ \rightarrow $$CH_4 + 2H_2O$

Question 20

Which of the following bacteria is most commonly associated with sexually transmitted infections in the United States?

Accepted Answer

Chlamydia trachomatis

Characterizing and Classifying Prokaryotes: Structured Study Notes

Study Guide - Practice Questions

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