Question 1

Which of the following best describes the main advantage of the three-domain system over the two-kingdom system in classifying microorganisms?

Accepted Answer

It recognizes fundamental genetic and biochemical differences between Bacteria, Archaea, and Eukarya.

Question 2

Which scientist is credited with developing the binomial nomenclature system for naming organisms?

Accepted Answer

Linnaeus

Question 3

A microbiologist isolates a population of bacteria from a patient sample. All cells are genetically identical and derived from a single parent cell. What is the correct term for this population?

Accepted Answer

Clone

Question 4

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

Accepted Answer

Presence of mitochondria

Question 5

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

Accepted Answer

To avoid confusion caused by common names in different languages and regions

Question 6

Which of the following statements about viruses is correct?

Accepted Answer

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

Question 7

A clinical laboratory uses a slide agglutination test to identify a bacterial isolate. What is the principle behind this test?

Accepted Answer

Bacteria agglutinate (clump) when mixed with specific antibodies.

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 best describes the endosymbiont theory?

Accepted Answer

Eukaryotic organelles such as mitochondria and chloroplasts originated from prokaryotic cells living inside ancestral eukaryotic cells.

Question 10

A new bacterial isolate is found to have a cell wall lacking peptidoglycan, branched membrane lipids, and initiates protein synthesis with methionine. To which domain does it most likely belong?

Accepted Answer

Archaea

Question 11

Which of the following techniques involves using fluorescently labeled DNA or RNA probes to stain and identify microorganisms directly in their environment?

Accepted Answer

Fluorescent in situ hybridization (FISH)

Question 12

A hospital outbreak of Salmonella is being investigated. Which method would best help determine if the isolates from different patients are the same strain?

Accepted Answer

Phage typing

Question 13

Which of the following is a correct sequence for the major taxa in biological classification, from broadest to most specific?

Accepted Answer

Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species

Question 14

Which of the following statements about Bergey’s Manual is correct?

Accepted Answer

It is used to classify and identify prokaryotes based on their evolutionary relationships and characteristics.

Question 15

Which of the following is a key difference between a dichotomous key and a cladogram?

Accepted Answer

A dichotomous key is used for identification, while a cladogram is used for classification based on evolutionary relationships.

Question 16

Which of the following best explains why two organisms with a DNA hybridization value greater than 70% are considered the same species?

Accepted Answer

They share a high degree of genomic similarity, indicating close evolutionary relatedness.

Question 17

Which of the following is a real-world application of the ELISA test?

Accepted Answer

Detecting the presence of HIV antibodies in a patient’s serum

Question 18

Which of the following statements about the use of rRNA sequencing in microbiology is correct?

Accepted Answer

It is used to determine evolutionary relationships among prokaryotes.

Question 19

A laboratory is using flow cytometry to analyze a bacterial sample. Which property is NOT typically measured by this technique?

Accepted Answer

Ability to ferment lactose

Question 20

Which of the following best describes a protist?

Accepted Answer

A catchall kingdom for mostly unicellular, nutritionally diverse eukaryotes

Classification and Identification of Microorganisms

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