Question 1

Which of the following statements best describes the relationship between genus and species in taxonomy?

Accepted Answer

A genus is a collection of related species.

Question 2

According to binomial nomenclature, which of the following is the correct way to write the scientific name for the bacterium Bacillus subtilis?

Accepted Answer

$	extit{Bacillus subtilis}$

Question 3

Which domain includes organisms that have rigid cell walls containing peptidoglycan?

Accepted Answer

Bacteria

Question 4

A scientist is studying a microorganism that is single-celled, lacks peptidoglycan in its cell wall, and thrives in extremely salty environments. To which domain does this organism most likely belong?

Accepted Answer

Archaea

Question 5

Which of the following kingdoms contains organisms that are photosynthetic and possess cell walls made of cellulose?

Accepted Answer

Kingdom Plantae

Question 6

A microbiologist observes a microorganism under the microscope and notes that it is a heterotrophic protist lacking a cell wall. Which classification is most appropriate for this organism?

Accepted Answer

Protozoa

Question 7

Which of the following is NOT a phenotypic method used for the identification and classification of prokaryotes?

Accepted Answer

DNA hybridization

Question 8

A laboratory technician performs a Gram stain to determine the chemical nature of a bacterial cell wall. What is the primary purpose of this procedure?

Accepted Answer

To distinguish between cell wall types based on peptidoglycan content

Question 9

Which genotypic method involves using strands of DNA to detect unique nucleotide sequences in a particular species?

Accepted Answer

Nucleic acid probes

Question 10

If two bacterial species have a similar ratio of guanine-cytosine (G+C) to adenine-thymine (A+T) base pairings, which genotypic method is being used to compare them?

Accepted Answer

DNA base ratio (G + C content)

Question 11

A researcher is comparing the sequence of 16S ribosomal nucleic acids between two bacterial species. What is the main goal of this analysis?

Accepted Answer

To assess the relatedness of the organisms

Question 12

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

Accepted Answer

It is a reference text for all known species of bacteria.

Question 13

A scientist is using numerical taxonomy to compare two bacterial species. Which of the following best describes this method?

Accepted Answer

Comparing all phenotypic characteristics to determine the total number of similarities

Question 14

Which of the following is a distinguishing feature of members of the domain Eukarya compared to Bacteria and Archaea?

Accepted Answer

They can be single-celled or multi-celled eukaryotes.

Question 15

Which of the following best explains why the current classification system is considered 'new and evolving'?

Accepted Answer

New categories may be created as new information is discovered.

Question 16

A microbiologist is trying to identify a bacterium that forms clusters and is spherical in shape. Which term best describes this arrangement?

Accepted Answer

Coccus

Question 17

Which of the following is a correct application of binomial nomenclature when referring to a group of species within a genus?

Accepted Answer

$	extit{Bacillus sp.}$

Question 18

A laboratory is using fatty acid analysis to identify a microorganism. What is being determined in this method?

Accepted Answer

The type and relative quantity of fatty acids in the cell membrane

Question 19

Which of the following is a characteristic of Kingdom Fungi?

Accepted Answer

Saprobic organisms with cell walls made of chitin

Question 20

A scientist is examining a microorganism that is classified by its type of reproduction and possesses cell walls made of chitin. Which kingdom does this organism belong to?

Accepted Answer

Kingdom Fungi

Taxonomy and Classification in Microbiology

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