Question 1

Which of the following best describes the main difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells contain membrane-bound organelles, while prokaryotic cells do not.

Question 2

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

Accepted Answer

Louis Pasteur

Question 3

A patient presents with a persistent infection on a catheter. Which microbial feature is most likely responsible for the persistence of this infection?

Accepted Answer

Biofilm formation

Question 4

Which of the following is a function of the bacterial capsule?

Accepted Answer

Attachment and evasion of immune response

Question 5

Which of the following statements about Archaea is correct?

Accepted Answer

Archaea are extremophiles and non-pathogenic.

Question 6

A Gram-negative bacterium is identified in a clinical sample. Which of the following features would you expect to find in its cell envelope?

Accepted Answer

Thin peptidoglycan layer and an outer membrane with LPS

Question 7

Which of the following best describes the role of ribosomes in prokaryotic cells?

Accepted Answer

Protein synthesis

Question 8

A scientist is using the scientific method to test a new antibiotic. Which of the following steps comes immediately after forming a hypothesis?

Accepted Answer

Experiment

Question 9

Which of the following is a correct statement about viruses?

Accepted Answer

Viruses are acellular and can infect all cell types.

Question 10

Which of the following best explains why Gram staining is important in clinical microbiology?

Accepted Answer

It helps identify bacteria and guides antibiotic treatment.

Question 11

A bacterial cell is found to survive extreme heat and desiccation. Which structure is most likely responsible for this ability?

Accepted Answer

Endospore

Question 12

Which of the following is a correct pairing of microbe and cell type?

Accepted Answer

Protozoa: Eukaryotic

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

A patient is diagnosed with tuberculosis, caused by an acid-fast bacterium. Which staining technique would be most appropriate for identification?

Accepted Answer

Acid-fast stain

Question 15

Which of the following is a correct statement about biofilms?

Accepted Answer

Biofilms are communities of microbes attached to surfaces.

Question 16

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

Accepted Answer

Motility

Question 17

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

Accepted Answer

Outer membrane containing lipopolysaccharide (LPS)

Question 18

Which of the following is an example of a eukaryotic microbe?

Accepted Answer

Amoeba

Question 19

Which of the following best describes the role of microbes in nutrient cycling?

Accepted Answer

Microbes are essential for recycling elements like carbon and nitrogen.

Question 20

A scientist observes a microbe with no nucleus, a single circular chromosome, and the ability to form endospores. Which group does this microbe most likely belong to?

Accepted Answer

Bacteria

Introduction to Microbiology and Cell Structure: Study Notes

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