Question 1

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

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 a bacterium?

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 examining 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 is using a catalase test to identify a bacterial species. Which classification method is being employed?

Accepted Answer

Metabolic differences (biochemical tests)

Question 7

Which of the following statements about the three domain system is correct?

Accepted Answer

Archaea and Bacteria both multiply by binary fission and move by flagella.

Question 8

Which phenotypic method would be most useful for distinguishing between Gram-positive and Gram-negative bacteria?

Accepted Answer

Gram stain

Question 9

A researcher compares the sequence of 16S ribosomal nucleic acids between two bacterial species. What is the primary purpose of this genotypic method?

Accepted Answer

To analyze and compare ribosomal RNA for determining relatedness

Question 10

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

Accepted Answer

Type of chlorophyll present

Question 11

If two bacterial species have a similar ratio of G+C to A+T base pairs, what does this suggest about their relationship?

Accepted Answer

They may be closely related, but further analysis is needed.

Question 12

Which of the following best describes pleomorphism in bacteria?

Accepted Answer

Bacteria that exhibit variable shapes within a species

Question 13

A scientist is using DNA hybridization to compare two organisms. Which result would indicate a close relationship?

Accepted Answer

High degree of nucleotide similarity

Question 14

Which of the following is TRUE regarding the use of Bergey’s Manual of Systematic Bacteriology?

Accepted Answer

It is considered the reference text for all known species of bacteria.

Question 15

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

Accepted Answer

$$	extit{Bacillus sp.}$$

Question 16

A microbiologist is comparing all phenotypic characteristics of two bacterial species to determine the total number of similarities. Which method is being used?

Accepted Answer

Numerical taxonomy

Question 17

Which of the following is a distinguishing feature of Kingdom Fungi?

Accepted Answer

Cell walls made of chitin

Question 18

A scientist is using a nucleic acid probe to identify a microorganism. What is the main principle behind this method?

Accepted Answer

Determining the presence of unique nucleotide sequences

Question 19

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

Accepted Answer

DNA hybridization

Question 20

A new microorganism is discovered. It is single-celled, lacks a nucleus, and has a cell wall without peptidoglycan. Which classification steps should be followed to properly identify and name this organism?

Accepted Answer

Characterize its features, classify it in the domain Archaea, and assign a binomial name following Linnaeus' system.

Taxonomy and Classification in Microbiology

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