Question 1

Which of the following best describes the process of binary fission in prokaryotic cells?

Accepted Answer

A cell divides into two daughter cells after replicating its DNA and forming a cross wall.

Question 2

Which of the following prokaryotic cell morphologies is characterized by a flexible, helical shape and is capable of axial filament-based motility?

Accepted Answer

Spirochete

Question 3

A microbiologist discovers a microorganism that thrives in water with 15% NaCl concentration and produces red pigments. Which group does this organism most likely belong to?

Accepted Answer

Halophilic archaea

Question 4

Which of the following statements about endospores is correct?

Accepted Answer

Endospores are produced by certain Gram-positive bacteria as a defensive strategy against unfavorable conditions.

Question 5

Which of the following equations correctly represents the process by which methanogenic archaea produce methane?

Accepted Answer

$$\mathrm{CO_2$ + 4H_2 \rightarrow CH_4$ + 2H_2O}$$

Question 6

Which of the following is a distinguishing feature of archaea compared to bacteria?

Accepted Answer

Cell membrane lipids with branched hydrocarbon chains

Question 7

A patient presents with a bacterial infection caused by an organism lacking a cell wall and showing a 'fried egg' colony appearance. Which genus is most likely responsible?

Accepted Answer

Mycoplasma

Question 8

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

Accepted Answer

Endospores are highly resistant to heat, desiccation, and disinfectants, making them difficult to eliminate.

Question 9

Which of the following groups of bacteria is known for forming branching filaments that resemble fungi and is important in antibiotic production?

Accepted Answer

Actinomycetes

Question 10

Which of the following is a correct pairing of a prokaryotic group and its ecological or medical significance?

Accepted Answer

Rhizobium – nitrogen fixation in plant root nodules

Question 11

Which of the following best describes the difference between cyanobacteria and green sulfur bacteria in terms of photosynthesis?

Accepted Answer

Cyanobacteria use water as an electron donor and produce oxygen, while green sulfur bacteria use other compounds and do not produce oxygen.

Question 12

Which of the following is NOT a method of asexual reproduction in prokaryotes?

Accepted Answer

Meiosis

Question 13

A bacterium is isolated from a hot spring with a temperature of 90ºC. Which of the following genera is it most likely to belong to?

Accepted Answer

Geogemma

Question 14

Which of the following best describes the arrangement of cocci in a staphylococcal cluster?

Accepted Answer

Grape-like clusters due to division in multiple planes

Question 15

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 16

Which of the following is a correct statement about the classification of prokaryotes?

Accepted Answer

Modern classification is based primarily on genetic relatedness of rRNA sequences.

Question 17

Which of the following is a characteristic of mycobacteria that contributes to their slow growth?

Accepted Answer

Presence of mycolic acid in the cell wall

Question 18

Which of the following best explains the ecological significance of deeply branching bacteria?

Accepted Answer

They are believed to resemble the earliest forms of bacteria and thrive in extreme environments similar to early Earth.

Question 19

Which of the following is a function of prosthecae in some Gram-negative proteobacteria?

Accepted Answer

Attachment to surfaces and increased surface area for nutrient absorption

Question 20

Which of the following genera is a nitrogen-fixing alphaproteobacterium that forms symbiotic relationships with legumes?

Accepted Answer

Rhizobium

Characterizing and Classifying Prokaryotes: Structure, Reproduction, and Diversity

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