Question 1

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

Accepted Answer

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

Question 2

A microbiologist observes a prokaryotic cell dividing by forming a small outgrowth that eventually detaches. Which method of reproduction is being observed?

Accepted Answer

Budding

Question 3

Which of the following best describes the main difference between binary fission and snapping division in prokaryotes?

Accepted Answer

Snapping division involves the rupture of the outer cell wall, while binary fission does not.

Question 4

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

Accepted Answer

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

Question 5

Why do some cocci form chains (streptococci) while others form clusters (staphylococci)?

Accepted Answer

The arrangement depends on the planes in which cells divide and whether the daughter cells remain attached.

Question 6

Which of the following is NOT a characteristic of Archaea?

Accepted Answer

Presence of peptidoglycan in the cell wall

Question 7

A sample is taken from a hot spring with a temperature of 90°C. Which group of prokaryotes is most likely to be found thriving in this environment?

Accepted Answer

Hyperthermophilic archaea such as Thermococcus or Pyrodictium

Question 8

Which of the following statements about methanogens is correct?

Accepted Answer

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

Question 9

Cyanobacteria are significant in Earth's history because they:

Accepted Answer

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

Question 10

Which of the following genera is known for producing antibiotics and forming branching filaments that resemble fungi?

Accepted Answer

Streptomyces

Question 11

A patient presents with tuberculosis. Which genus of high G + C Gram-positive bacteria is most likely responsible?

Accepted Answer

Mycobacterium

Question 12

Which of the following best describes the role of Rhizobium in agriculture?

Accepted Answer

It fixes atmospheric nitrogen in association with plant roots, improving soil fertility.

Question 13

Which of the following is a distinguishing feature of Mycoplasmas?

Accepted Answer

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

Question 14

A water treatment plant is experiencing blockages due to the formation of flocs. Which genus of Betaproteobacteria is most likely responsible for this problem?

Accepted Answer

Sphaerotilus

Question 15

Which of the following best explains why bacteria with widely divergent oxygen tolerances, sizes, shapes, and nutritional requirements are all classified in the same domain (Bacteria)?

Accepted Answer

They share fundamental genetic and biochemical characteristics that distinguish them from Archaea and Eukarya.

Question 16

Which of the following is a correct match between a bacterial genus and a disease it causes?

Accepted Answer

Bordetella – pertussis (whooping cough)

Question 17

Which of the following equations correctly represents the process of nitrogen fixation by some cyanobacteria?

Accepted Answer

$$ \mathrm{N_2$ + 8H^+ + 8e^- + 16ATP \rightarrow 2NH_3 + H_2$ + 16ADP + 16P_i} $$

Question 18

A patient is diagnosed with a urinary tract infection caused by a Gram-negative, oxidase-negative, peritrichously flagellated rod. Which genus is most likely responsible?

Accepted Answer

Proteus

Question 19

Which of the following best describes the ecological role of Desulfovibrio (a Deltaproteobacteria)?

Accepted Answer

It reduces sulfate to hydrogen sulfide, playing a role in the sulfur cycle.

Characterizing and Classifying Prokaryotes: Structure, Diversity, and Taxonomy

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