Question 1

Which of the following statements best describes the difference between Bacteria and Archaea in the three-domain system?

Accepted Answer

Bacteria have peptidoglycan in their cell walls, while Archaea do not.

Question 2

A scientist discovers a new microorganism that is unicellular, lacks a nucleus, and has a cell wall without peptidoglycan. To which domain does this organism most likely belong?

Accepted Answer

Archaea

Question 3

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 4

Which method would be LEAST useful for distinguishing between two bacterial species that are morphologically identical?

Accepted Answer

Morphology

Question 5

Which of the following is NOT a criterion used to define a viral species?

Accepted Answer

Ability to breed among themselves

Question 6

A population of genetically different cells within a clone is best described as a:

Accepted Answer

Strain

Question 7

Which of the following is TRUE regarding viruses?

Accepted Answer

They are not classified under any of the three domains because they are not composed of cells.

Question 8

Which of the following best describes binomial nomenclature?

Accepted Answer

Each organism is assigned two names: genus and species.

Question 9

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

Accepted Answer

Homo sapiens

Question 10

A microbiologist is trying to identify an unknown bacterium. Which of the following methods would be most useful if the bacterium’s cell wall composition is unique?

Accepted Answer

Differential staining

Question 11

Which of the following statements about the domain Eukarya is correct?

Accepted Answer

It includes animals, plants, fungi, and protists.

Question 12

Which manual is commonly used for the classification of prokaryotes?

Accepted Answer

Bergey’s Manual

Question 13

Which of the following best defines a prokaryotic species?

Accepted Answer

A population of cells with a high degree of genomic similarity

Question 14

Which of the following is NOT one of the four kingdoms under the domain Eukarya?

Accepted Answer

Monera

Question 15

A scientist is comparing two bacterial strains. Which method would best help determine if they belong to the same species?

Accepted Answer

Sequencing and other molecular tests

Question 16

Which of the following is a correct statement about phylogenetic relationships?

Accepted Answer

They study the evolutionary history of organisms.

Question 17

Which of the following is NOT a method used for classifying microorganisms?

Accepted Answer

Measuring gravitational force

Question 18

Which of the following best describes a clone in microbiology?

Accepted Answer

A population of cells derived from a single cell

Question 19

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

Accepted Answer

Presence of peptidoglycan in the cell wall

Question 20

A new microorganism is discovered that can survive in extreme environments, lacks peptidoglycan, and is unicellular. Which domain does it most likely belong to, and what is a key feature that supports this classification?

Accepted Answer

Archaea; lack of peptidoglycan in the cell wall

Classification of Microorganisms: Taxonomy, Domains, and Methods

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