Question 1

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

Accepted Answer

Endospores are highly resistant to heat, desiccation, and chemicals, making them difficult to eliminate using standard sterilization methods.

Question 2

A microbiologist isolates a prokaryote from a hot spring that thrives at 90°C and has branched hydrocarbon chains in its membrane lipids. Which group does this organism most likely belong to?

Accepted Answer

Euryarchaeota

Question 3

Which of the following best describes the process of binary fission in prokaryotes?

Accepted Answer

A single cell replicates its DNA, elongates, forms a cross wall, and divides into two genetically identical daughter cells.

Question 4

Which of the following equations correctly represents the conversion of carbon dioxide and hydrogen gas to methane by methanogens?

Accepted Answer

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

Question 5

Which of the following is a unique feature of Mycoplasmas among the low G + C Gram-positive bacteria?

Accepted Answer

They lack a cell wall, making them resistant to antibiotics that target peptidoglycan synthesis.

Question 6

A patient is diagnosed with a disease caused by a Gram-negative, intracellular pathogen transmitted by the bite of an arthropod. Which genus is most likely responsible?

Accepted Answer

Rickettsia

Question 7

Which of the following best explains why cyanobacteria are considered crucial in Earth's history?

Accepted Answer

They performed oxygenic photosynthesis, transforming the early anaerobic atmosphere into one containing oxygen.

Question 8

Which of the following is a correct statement about the arrangement of prokaryotic cells?

Accepted Answer

The arrangement depends on the planes in which cells divide and whether daughter cells separate after division.

Question 9

Which of the following best describes the role of Bacillus thuringiensis in agriculture?

Accepted Answer

It produces a toxin used as an insecticide to protect crops.

Question 10

A scientist discovers a prokaryote that can only survive in environments with greater than 9% NaCl. Which group does this organism most likely belong to?

Accepted Answer

Halophilic archaea

Question 11

Which of the following is a distinguishing feature of Actinomycetes among the high G + C Gram-positive bacteria?

Accepted Answer

They form branching filaments that resemble fungi.

Question 12

Which of the following best describes the metabolic strategy of glycolytic facultative anaerobes in the class Gammaproteobacteria?

Accepted Answer

They catabolize carbohydrates by glycolysis and the pentose phosphate pathway.

Question 13

Which of the following is true regarding the reproduction of Epulopiscium?

Accepted Answer

It reproduces by viviparity, where live offspring emerge from the body of the dead mother cell.

Question 14

Which of the following is a correct statement about the cell wall composition of Archaea?

Accepted Answer

They lack true peptidoglycan in their cell walls.

Question 15

Which of the following genera is most associated with the production of environmental methane?

Accepted Answer

Methanogens

Question 16

A patient presents with a respiratory infection. Laboratory results show the causative agent is a Gram-negative rod with polar flagella, capable of breaking down numerous organic compounds. Which genus is most likely responsible?

Accepted Answer

Pseudomonas

Question 17

Which of the following best explains why Deinococcus is considered unique among bacteria?

Accepted Answer

It has an outer membrane similar to Gram-negatives but stains Gram-positive.

Question 18

Which of the following is a characteristic of Chlamydias?

Accepted Answer

They grow intracellularly in mammals, birds, and some invertebrates.

Question 19

Which of the following best describes the movement of spirochetes?

Accepted Answer

They move in a corkscrew motion due to axial filaments.

Characterizing and Classifying Prokaryotes: Structured Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard