Question 1

Which of the following best describes the main limitation of the two-kingdom classification system proposed by Linnaeus?

Accepted Answer

It grouped all prokaryotes and eukaryotes together, failing to distinguish fundamental cellular differences.

Question 2

Which scientist is credited with developing the three-domain system based on rRNA nucleotide sequences?

Accepted Answer

Carl Woese

Question 3

Which of the following is NOT a characteristic used to differentiate the domains Bacteria, Archaea, and Eukarya?

Accepted Answer

Ability to photosynthesize

Question 4

Why are scientific names (binomial nomenclature) used in microbiology?

Accepted Answer

To avoid confusion caused by regional and language differences

Question 5

Which of the following best describes the endosymbiont theory?

Accepted Answer

Eukaryotes evolved from the fusion of two prokaryotic cells, with one living inside the other as an endosymbiont.

Question 6

A population of cells derived from a single parent cell is known as a:

Accepted Answer

Clone

Question 7

Which of the following is a key advantage of the three-domain system over the five-kingdom system?

Accepted Answer

It recognizes fundamental genetic differences between Bacteria and Archaea.

Question 8

Which method would be most appropriate for identifying a bacterium that cannot be cultured in the laboratory?

Accepted Answer

Nucleic Acid Amplification Test (NAAT) such as PCR

Question 9

Which of the following statements about viruses is correct?

Accepted Answer

They are not composed of cells and require a host cell for replication.

Question 10

Which of the following techniques involves the use of fluorescent DNA or RNA probes to stain microorganisms in situ?

Accepted Answer

Fluorescent in situ hybridization (FISH)

Question 11

A dichotomous key is primarily used for which of the following purposes?

Accepted Answer

Identification of unknown organisms through a series of choices

Question 12

Which of the following best describes a 'strain' in microbiology?

Accepted Answer

Genetically different cells within a clone

Question 13

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

Accepted Answer

Membrane lipids composed of branched carbon chains attached to glycerol by ether linkage

Question 14

Which of the following is true regarding the use of ELISA in clinical microbiology?

Accepted Answer

It can be used to detect either microbial antigens or patient antibodies, depending on the protocol.

Question 15

Which of the following is a correct statement about the use of rRNA sequencing in microbial classification?

Accepted Answer

It provides information about evolutionary relationships among prokaryotes.

Question 16

A clinical laboratory receives a sample suspected to contain Salmonella enterica. Which of the following would be the most rapid and specific method to confirm its identity?

Accepted Answer

Phage typing

Question 17

Which of the following is a major characteristic used to differentiate the three kingdoms of multicellular Eukarya?

Accepted Answer

Type of cell wall and mode of nutrition

Question 18

Which of the following statements about nucleic acid hybridization is correct?

Accepted Answer

A high degree of hybridization (\u003e70%) indicates the organisms are the same species.

Question 19

Which of the following is a real-world application of flow cytometry in microbiology?

Accepted Answer

Separating bacterial cells based on size and fluorescence without culturing

Question 20

Which of the following best explains why Bergey’s Manual is important in microbiology?

Accepted Answer

It provides identification schemes and classification for bacteria and archaea based on multiple criteria.

Chapter 10: Classification of Microorganisms – Structured Study Notes

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