Question 1

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

Accepted Answer

To show relationships among organisms and provide a means of identification

Question 2

Why was the two-kingdom classification system considered inadequate for classifying bacteria?

Accepted Answer

Bacteria lack the characteristics of plants, such as chloroplasts and multicellularity

Question 3

Which scientist is credited with introducing the three-domain system based on ribosomal RNA sequencing?

Accepted Answer

Woese

Question 4

What is a major advantage of the three-domain system over the five-kingdom system?

Accepted Answer

It reflects evolutionary relationships using molecular evidence such as ribosomal RNA sequences

Question 5

Which of the following is NOT a characteristic used to differentiate the domains Bacteria, Archaea, and Eukarya?

Accepted Answer

Ability to photosynthesize

Question 6

Why is binomial nomenclature preferable to the use of common names in scientific communication?

Accepted Answer

It ensures each organism has a unique, universally accepted name

Question 7

Given the following scenario: You are growing methicillin-resistant Staphylococcus aureus (MRSA) in the lab. Which sentence correctly uses the terms species, culture, clone, and strain?

Accepted Answer

A strain of MRSA species is grown as a culture, and each clone represents a genetically identical group.

Question 8

A newly discovered organism is multicellular, nucleated, heterotrophic, and has cell walls. To which kingdom does it most likely belong?

Accepted Answer

Fungi

Question 9

Which of the following best defines a protist?

Accepted Answer

A unicellular or simple multicellular eukaryote that is not classified as a plant, animal, or fungus

Question 10

Why does the definition of a viral species not apply to bacterial species?

Accepted Answer

Bacteria are defined by genetic and phenotypic similarity, not by ecological niche alone

Question 11

Which of the following statements correctly differentiates classification from identification?

Accepted Answer

Classification groups organisms by similar characteristics, while identification determines the identity of unknown organisms

Question 12

What is the primary purpose of Bergey’s Manual of Determinative Bacteriology?

Accepted Answer

To serve as a standard reference for laboratory identification of bacteria

Question 13

Which laboratory technique is most useful for rapidly identifying Staphylococcus aureus?

Accepted Answer

Biochemical tests for enzyme presence, such as the coagulase test

Question 14

Which of the following best describes the difference between Western blotting and Southern blotting?

Accepted Answer

Western blotting detects proteins, while Southern blotting detects DNA

Question 15

Phage typing is used to identify bacteria based on:

Accepted Answer

Their susceptibility to specific bacteriophages

Question 16

Which molecular technique can amplify a small amount of microbial DNA for identification purposes?

Accepted Answer

PCR (Polymerase Chain Reaction)

Question 17

Which of the following techniques involves nucleic acid hybridization?

Accepted Answer

DNA chips

Question 18

A dichotomous key is primarily used for:

Accepted Answer

Identification of unknown organisms through a series of choices

Question 19

If the percentage of guanine-cytosine ($$GC) $$base pairs in the DNA of two bacteria is significantly different, what does this suggest about their relationship?

Accepted Answer

They are likely not closely related

Question 20

A researcher uses restriction enzymes to cut bacterial DNA and analyzes the resulting fragment sizes. This method is known as:

Accepted Answer

DNA fingerprinting

Microbiology: Classification of Microorganisms – Guided Study Notes

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