Question 1

Which scientist is credited with disproving the theory of spontaneous generation through his swan-neck flask experiment?

Accepted Answer

Louis Pasteur

Question 2

Which of the following best describes the function of the bacterial capsule?

Accepted Answer

Attachment and evasion of immune system

Question 3

A patient develops an infection after a catheter is inserted. Which microbial feature most likely contributed to the persistence of this infection?

Accepted Answer

Biofilm formation

Question 4

Which of the following is a distinguishing feature of Gram-negative bacteria?

Accepted Answer

Presence of lipopolysaccharide (LPS) in the outer membrane

Question 5

Which of the following equations correctly represents the scientific method as applied in microbiology?

Accepted Answer

$Observation \rightarrow Hypothesis \rightarrow Experiment \rightarrow Data\ Analysis \rightarrow Conclusion$

Question 6

Which of the following statements about Archaea is correct?

Accepted Answer

They are extremophiles and non-pathogenic.

Question 7

A Gram stain is performed on a bacterial sample. The cells appear purple under the microscope. What does this indicate about the cell wall structure?

Accepted Answer

The bacteria have a thick peptidoglycan layer and no outer membrane.

Question 8

Which of the following best describes the role of plasmids in bacteria?

Accepted Answer

They are extrachromosomal DNA that can carry antibiotic resistance genes.

Question 9

Which of the following is NOT a function of normal microbiota?

Accepted Answer

Causing disease in all individuals

Question 10

Which of the following best explains why endospores are clinically significant?

Accepted Answer

They allow bacteria to survive extreme conditions and persist during sterilization.

Question 11

Which of the following is a correct comparison between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotes have a nucleus; prokaryotes do not.

Question 12

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

Accepted Answer

Using bacteria for fermentation in food production

Question 13

Which of the following best describes the function of the plasma membrane in prokaryotic cells?

Accepted Answer

It regulates the entry and exit of substances.

Question 14

Which of the following is a correct statement about viruses?

Accepted Answer

They are acellular and infect all cell types.

Question 15

Which of the following best describes the difference between passive and active transport across the plasma membrane?

Accepted Answer

Active transport requires ATP; passive transport does not.

Question 16

Which of the following is a key feature of eukaryotic cells but not prokaryotic cells?

Accepted Answer

Presence of membrane-bound organelles

Question 17

Which of the following is the correct order for the Gram stain procedure?

Accepted Answer

Crystal violet, iodine, alcohol, safranin

Question 18

Which of the following best describes the role of flagella in bacteria?

Accepted Answer

Motility

Question 19

Which of the following is a correct statement about prions?

Accepted Answer

They are infectious proteins.

Question 20

Which of the following is a correct example of a eukaryotic microorganism?

Accepted Answer

Amoeba

Introduction to Microbiology & Prokaryotic Cell Structure: Study Notes

Study Guide - Practice Questions