Question 1

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

Accepted Answer

It recognizes fundamental differences in rRNA sequences among major groups of organisms.

Question 2

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

Accepted Answer

Linnaeus

Question 3

A microbiologist isolates a bacterium that can survive in extremely high salt concentrations. To which domain is this organism most likely to belong?

Accepted Answer

Archaea

Question 4

Which of the following is NOT a characteristic used to differentiate the three domains of life?

Accepted Answer

Presence of mitochondria

Question 5

Why are scientific names used instead of common names in microbiology?

Accepted Answer

To avoid confusion caused by language and geographic differences

Question 6

Which of the following statements about the endosymbiont theory is correct?

Accepted Answer

Mitochondria and chloroplasts originated from engulfed prokaryotic cells.

Question 7

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

Accepted Answer

Clone

Question 8

Which of the following is a correct example of binomial nomenclature?

Accepted Answer

Homo sapiens

Question 9

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

Accepted Answer

Nucleic acid amplification tests (NAATs) such as PCR

Question 10

A scientist uses a DNA probe to detect the presence of a specific bacterial gene in a sample. Which technique is being used?

Accepted Answer

Southern blotting

Question 11

Which of the following best describes a dichotomous key?

Accepted Answer

A tool used for the identification of organisms based on a series of choices

Question 12

Which of the following is a major difference between prokaryotic and eukaryotic cells?

Accepted Answer

Prokaryotic cells lack a nucleus, while eukaryotic cells have a nucleus.

Question 13

Which of the following is NOT a method used to identify bacteria in clinical microbiology?

Accepted Answer

Photosynthetic pigment analysis

Question 14

A laboratory uses flow cytometry to analyze a bacterial sample. What is a key advantage of this method?

Accepted Answer

It can separate cells based on size and fluorescence without culturing.

Question 15

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 16

Which of the following is a correct statement about nucleic acid hybridization?

Accepted Answer

A high degree of hybridization indicates close genetic relatedness.

Question 17

Which of the following is a key feature of the kingdom Fungi?

Accepted Answer

Chemoheterotrophic nutrition and cell walls of chitin

Question 18

A patient is tested for HIV using an indirect ELISA. What is being detected in this test?

Accepted Answer

Antibodies against HIV in the patient's serum

Question 19

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

Accepted Answer

Genetically different cells within a clone

Question 20

Which of the following techniques involves the use of fluorescent DNA or RNA probes to identify microorganisms directly in environmental samples?

Accepted Answer

FISH (Fluorescent In Situ Hybridization)

Classification of Microorganisms: Taxonomy, Phylogeny, and Identification

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