Question 1

Which scientist is known as the 'Father of Taxonomy' and established the binomial nomenclature system for classifying organisms?

Accepted Answer

Carl Linnaeus

Question 2

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 3

Which domain contains organisms that are prokaryotic and often live in extreme environments, but have no known pathogens?

Accepted Answer

Archaea

Question 4

A microbiologist observes a microbe that is unicellular, lacks a membrane-bound nucleus, and has a thick peptidoglycan cell wall. After Gram staining, the cells appear purple. Which group does this microbe most likely belong to?

Accepted Answer

Gram-positive bacteria

Question 5

Which of the following best describes the function of immersion oil in light microscopy?

Accepted Answer

It increases the refractive index between the slide and the objective lens, reducing light scattering.

Question 6

A scientist is using a compound light microscope with a 10X ocular lens and a 40X objective lens. What is the total magnification?

Accepted Answer

$$10 	imes 40 = 400$$

Question 7

Which staining technique would you use to differentiate between bacteria with thick and thin peptidoglycan layers?

Accepted Answer

Gram stain

Question 8

Which of the following statements about Gram-negative bacteria is TRUE?

Accepted Answer

They possess an outer membrane containing lipopolysaccharide (LPS).

Question 9

Which microscopy technique would be most appropriate for visualizing the surface structure of a virus at high resolution?

Accepted Answer

Scanning electron microscopy (SEM)

Question 10

A patient is diagnosed with tuberculosis. The causative agent is found to have a waxy cell wall rich in mycolic acid. Which staining technique would best identify this pathogen?

Accepted Answer

Acid-fast stain

Question 11

Which of the following best explains why Gram-negative bacteria are generally more resistant to antibiotics that target peptidoglycan synthesis?

Accepted Answer

Their outer membrane acts as a selective barrier, limiting drug entry.

Question 12

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

Accepted Answer

Escherichia coli

Question 13

Which of the following best describes the difference between simple diffusion and facilitated diffusion across the plasma membrane?

Accepted Answer

Facilitated diffusion requires membrane proteins, while simple diffusion does not.

Question 14

A bacterial cell is placed in a hypertonic solution. What is the most likely outcome?

Accepted Answer

The cell will lose water and undergo plasmolysis.

Question 15

Which of the following is a unique feature of acid-fast bacteria?

Accepted Answer

Presence of mycolic acid in the cell wall

Question 16

Which of the following best describes the function of porins in Gram-negative bacteria?

Accepted Answer

They form protein channels that allow passage of certain molecules through the outer membrane.

Question 17

Which of the following is NOT a step in Koch’s postulates for establishing a causative relationship between a microbe and a disease?

Accepted Answer

The microbe must be resistant to all antibiotics.

Question 18

Which of the following best explains why Mycoplasma species are resistant to antibiotics that target cell wall synthesis?

Accepted Answer

They lack a cell wall entirely.

Question 19

Which of the following is a real-world example of the application of the scientific method in microbiology?

Accepted Answer

Testing the effect of handwashing on disease incidence in a hospital.

Question 20

Which of the following best describes the main difference between transmission electron microscopy (TEM) and scanning electron microscopy (SEM)?

Accepted Answer

TEM generates 2D images of internal structures, while SEM generates 3D images of the surface.

Foundations of Microbiology: Taxonomy, Microscopy, and Bacterial Cell Structure

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