Question 1

Which of the following best describes the main purpose of taxonomy in microbiology?

Accepted Answer

To provide a universal system for naming and classifying organisms based on evolutionary relationships

Question 2

According to the three-domain system proposed by Carl Woese, which of the following is NOT a domain?

Accepted Answer

Protista

Question 3

Which of the following statements about binomial nomenclature is correct?

Accepted Answer

The genus name is capitalized and the species name is lowercase, both italicized or underlined

Question 4

A microbiologist isolates a new bacterial strain and names it Escherichia coli O157:H7. What does 'O157:H7' represent?

Accepted Answer

A specific strain of Escherichia coli

Question 5

Which of the following is a correct sequence in the taxonomic hierarchy from broadest to most specific?

Accepted Answer

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

Question 6

Which of the following methods is LEAST likely to be used for classifying prokaryotes?

Accepted Answer

Observation of reproductive organs

Question 7

A scientist is using DNA fingerprinting to compare two bacterial isolates. What is the main principle behind this method?

Accepted Answer

Comparing patterns of DNA fragments after restriction enzyme digestion

Question 8

Which of the following is a defining characteristic of viruses that distinguishes them from organisms in the three-domain system?

Accepted Answer

They are not composed of cells and require host machinery to replicate

Question 9

Which suffix is used for the family names of viruses according to the International Committee on Taxonomy of Viruses (ICTV)?

Accepted Answer

-viridae

Question 10

A researcher is classifying a microorganism that lacks a nucleus, has ether-linked membrane lipids, and is not sensitive to antibiotics. To which domain does this organism most likely belong?

Accepted Answer

Archaea

Question 11

Which of the following best explains why viruses are not classified within the three-domain system?

Accepted Answer

Viruses are not composed of cells and cannot carry out metabolism independently

Question 12

Which of the following is a correct example of scientific nomenclature for a bacterium?

Accepted Answer

$	extit{Escherichia coli}$

Question 13

Which of the following is NOT a characteristic used to classify prokaryotes?

Accepted Answer

Presence of a nucleus

Question 14

A new microorganism is discovered that has a peptidoglycan cell wall, is sensitive to antibiotics, and has formylmethionine as the first amino acid in protein synthesis. To which domain does it most likely belong?

Accepted Answer

Bacteria

Question 15

Which of the following best describes a 'strain' in bacterial nomenclature?

Accepted Answer

A subgroup within a species that has distinct characteristics

Question 16

Which of the following is a unique feature of Archaea compared to Bacteria and Eukarya?

Accepted Answer

Membrane lipids with ether linkages

Question 17

Which of the following classification methods would be most useful for distinguishing between two closely related bacterial strains that are morphologically identical?

Accepted Answer

DNA sequencing of rRNA genes

Question 18

Which of the following statements about prions is correct?

Accepted Answer

Prions are infectious protein particles that lack nucleic acids

Question 19

A viroid is best described as:

Accepted Answer

An infectious piece of RNA that causes some plant diseases

Question 20

Which of the following is the correct order of taxonomic ranks from most inclusive to least inclusive?

Accepted Answer

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

Classification and Taxonomy of Microorganisms

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