Question 1

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

Accepted Answer

The cell replicates its DNA, elongates, and divides into two genetically identical cells without mitosis.

Question 2

Which of the following is NOT a typical shape observed in prokaryotic cells?

Accepted Answer

Pyramidal

Question 3

A microbiologist observes a chain of spherical bacteria under the microscope. Which term best describes this arrangement?

Accepted Answer

Streptococcus

Question 4

Which of the following statements correctly distinguishes Archaea from Bacteria?

Accepted Answer

Archaea have ether-linked membrane lipids, while Bacteria have ester-linked membrane lipids.

Question 5

Which of the following is a medically important member of the phylum Firmicutes?

Accepted Answer

Staphylococcus aureus

Question 6

Endospores are significant in microbiology because:

Accepted Answer

They enable bacteria to survive harsh environmental conditions, such as extreme heat and desiccation.

Question 7

Which step occurs first during binary fission in prokaryotes?

Accepted Answer

The DNA is replicated.

Question 8

Which of the following bacterial phyla includes organisms that are obligate intracellular parasites and are responsible for diseases such as trachoma and psittacosis?

Accepted Answer

Chlamydiae

Question 9

A patient is diagnosed with tuberculosis. Which bacterial phylum does the causative agent belong to?

Accepted Answer

Actinobacteria

Question 10

Which of the following is a key feature of the phylum Spirochaetes?

Accepted Answer

Cells are spiral-shaped and move via axial filaments.

Question 11

Which of the following equations best represents the exponential growth of bacteria during binary fission, where $$N_0 is $$the initial number of cells, $$n is $$the number of generations, and $$N is $$the final number of cells?

Accepted Answer

$$N = N_0$ 	imes 2^n$$

Question 12

Which of the following is a distinguishing feature of Archaea compared to Bacteria?

Accepted Answer

Archaea lack peptidoglycan in their cell walls.

Question 13

Which of the following genera is a key etiologic agent of Lyme disease and belongs to the phylum Spirochaetes?

Accepted Answer

Borrelia

Question 14

A laboratory technician finds a Gram-negative, rod-shaped bacterium that is a common cause of urinary tract infections. To which phylum does this organism most likely belong?

Accepted Answer

Proteobacteria

Question 15

Which of the following best explains why endospores are a concern in hospital sterilization procedures?

Accepted Answer

Endospores are resistant to heat, chemicals, and radiation, making them difficult to destroy.

Question 16

Which of the following is a correct pairing of a bacterial phylum and a medically important genus within it?

Accepted Answer

Firmicutes – Bacillus

Question 17

Which of the following statements about prokaryotic cell arrangements is correct?

Accepted Answer

Diplococcus refers to pairs of spherical cells.

Question 18

A patient presents with botulism, a potentially fatal disease. Which bacterial genus is responsible, and to which phylum does it belong?

Accepted Answer

Clostridium; Firmicutes

Question 19

Which of the following is a unique feature of Cyanobacteria among the six major bacterial phyla discussed?

Accepted Answer

They are capable of oxygenic photosynthesis.

Question 20

A researcher is studying a prokaryote that thrives in extremely salty environments and lacks peptidoglycan in its cell wall. To which group does this organism most likely belong?

Accepted Answer

Archaea

Chapter 11: Characterizing and Classifying Prokaryotes – Study Notes

Study Guide - Practice Questions

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