Question 1

Which of the following statements best describes the primary purpose of taxonomy in microbiology?

Accepted Answer

To provide universal names for organisms and a reference for identifying them.

Question 2

Which domain includes organisms that are prokaryotic and typically have peptidoglycan in their cell walls?

Accepted Answer

Bacteria

Question 3

A scientist discovers a unicellular organism that lacks a nucleus and thrives in extremely salty environments. To which domain does this organism most likely belong?

Accepted Answer

Archaea

Question 4

Which of the following is the correct format for writing a scientific name according to binomial nomenclature?

Accepted Answer

Escherichia coli

Question 5

In the taxonomic hierarchy, which level comes directly above 'Genus'?

Accepted Answer

Family

Question 6

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

Accepted Answer

A group of genetically different cells resulting from genetic divergence within a clone.

Question 7

Which method would be most appropriate for identifying bacteria based on their ability to metabolize lactose and produce acid or gas?

Accepted Answer

Biochemical tests

Question 8

A clinical microbiology lab uses a slide agglutination test to identify an unknown bacterium. What result indicates a positive identification?

Accepted Answer

Clumping of bacteria due to antibody-antigen reaction

Question 9

Which of the following is a distinguishing feature of the domain Eukarya?

Accepted Answer

Organisms have a true nucleus.

Question 10

Which identification method relies on the specificity of bacteriophages for certain bacterial species?

Accepted Answer

Phage typing

Question 11

A population of viruses with similar characteristics that occupies a particular ecological niche is referred to as a:

Accepted Answer

Viral species

Question 12

Which of the following kingdoms includes multicellular organisms with cellulose cell walls that are usually photoautotrophic?

Accepted Answer

Plantae

Question 13

Which of the following is NOT a characteristic of the kingdom Animalia?

Accepted Answer

Cell walls made of cellulose

Question 14

Which molecular method can be used to track the source of an infectious disease outbreak by comparing DNA banding patterns?

Accepted Answer

DNA fingerprinting

Question 15

Which of the following statements about prokaryotic species is correct?

Accepted Answer

They are populations of cells with similar characteristics that reproduce asexually.

Question 16

Which of the following is the correct order of the taxonomic hierarchy from broadest to most specific?

Accepted Answer

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

Question 17

A laboratory uses PCR to amplify a specific DNA sequence from a bacterial sample. Which step is essential for the specificity of this method?

Accepted Answer

Designing primers that match the target DNA sequence

Question 18

Which of the following is a reason why scientific names are preferred over common names in microbiology?

Accepted Answer

Scientific names avoid problems and conflicts associated with language and geography.

Question 19

Which of the following kingdoms is considered a 'catchall' for eukaryotic organisms that do not fit into other kingdoms?

Accepted Answer

Protista

Question 20

A patient is infected with E. coli O157:H7. What does the 'O157:H7' designation refer to?

Accepted Answer

A specific strain identified by its antigenic properties

Classification of Microorganisms: Taxonomy, Phylogeny, and the Three-Domain System

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