Question 1

Which of the following statements best explains why Pneumocystis jirovecii was reclassified from a protozoan to a fungus?

Accepted Answer

DNA analysis revealed genetic similarities to fungi.

Question 2

Which of the following is the correct format for writing the scientific name of the bread mold?

Accepted Answer

$$Rhizopus\ stolonifer$$

Question 3

Which hierarchical taxonomic rank is immediately broader than 'family'?

Accepted Answer

Order

Question 4

Why is taxonomy important in microbiology?

Accepted Answer

It provides a universal language for identifying organisms.

Question 5

Which of the following characteristics is unique to Archaea compared to Bacteria?

Accepted Answer

Ability to live in extreme environments

Question 6

Which evidence is most commonly used to classify microorganisms into the three domains?

Accepted Answer

rRNA sequencing

Question 7

According to the endosymbiotic theory, which organelles are believed to have originated from prokaryotic cells?

Accepted Answer

Mitochondria and chloroplasts

Question 8

Which of the following best describes a prokaryotic species?

Accepted Answer

A population of cells with similar characteristics

Question 9

Which method is most useful for distinguishing between closely related bacterial species?

Accepted Answer

DNA fingerprinting

Question 10

Which of the following is NOT a characteristic of viruses?

Accepted Answer

Contain both DNA and RNA in the same particle

Question 11

A scientist isolates a microorganism with the following features: no nucleus, peptidoglycan cell wall, and 70S ribosomes. To which domain does this organism most likely belong?

Accepted Answer

Bacteria

Question 12

Which of the following is a correct statement about the difference between prokaryotic and eukaryotic cell division?

Accepted Answer

Prokaryotes divide by binary fission, eukaryotes by mitosis.

Question 13

Which of the following kingdoms includes organisms that absorb dissolved organic matter through their plasma membrane and have cell walls made of chitin?

Accepted Answer

Fungi

Question 14

Which of the following is the best reason why bacteria should not be placed in the plant kingdom?

Accepted Answer

They lack a nucleus and have peptidoglycan cell walls.

Question 15

A pure culture of bacteria that is genetically identical and derived from a single parent cell is called a:

Accepted Answer

Clone

Question 16

Which of the following is a distinguishing feature of eukaryotic cells compared to prokaryotic cells?

Accepted Answer

Presence of membrane-bound organelles

Question 17

Which of the following methods is most useful for identifying eukaryotic microorganisms?

Accepted Answer

Morphological characteristics

Question 18

Which of the following best describes the concept of phylogeny?

Accepted Answer

The study of evolutionary relationships among organisms

Question 19

Which of the following is a correct comparison between Archaea and Eukarya?

Accepted Answer

Both have similar rRNA sequences.

Question 20

A clinical microbiology lab uses Bergey’s Manual of Systematic Bacteriology to identify an unknown bacterium. What type of information is primarily used in this manual?

Accepted Answer

Phylogenetic information based on rRNA sequencing

The Classification of Microorganisms: Taxonomy, Domains, and the Diversity of Life

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