Question 1

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

Accepted Answer

Eukaryotic cells have a true nucleus, whereas prokaryotic cells lack a membrane-bound nucleus.

Question 2

Which scientist’s experiments disproved the theory of spontaneous generation and supported the concept of biogenesis?

Accepted Answer

Louis Pasteur

Question 3

A microbiologist is using a light microscope with an objective lens of 40x and an ocular lens of 10x. What is the total magnification?

Accepted Answer

$$40 	imes 10 = 400$$

Question 4

Which of the following is NOT a correct pairing of microorganism and its characteristic?

Accepted Answer

Fungi – photosynthetic

Question 5

Which staining technique is most useful for distinguishing between Gram-positive and Gram-negative bacteria?

Accepted Answer

Gram stain

Question 6

A bacterial culture is exposed to a chemical agent that disrupts the plasma membrane. Which of the following cellular processes would be most directly affected?

Accepted Answer

Selective permeability and transport of molecules

Question 7

Which of the following best explains why a negative stain does not color the cell?

Accepted Answer

The dye is repelled by the negatively charged cell surface.

Question 8

Which of the following is a correct statement about Koch’s postulates?

Accepted Answer

They provide a systematic method to link a specific microbe to a specific disease.

Question 9

A microbiologist wants to culture an obligate anaerobe. Which of the following methods would be most appropriate?

Accepted Answer

Grow the culture in an anaerobic jar with a chemical gas pack.

Question 10

Which of the following best describes the mechanism of action of penicillin?

Accepted Answer

Inhibits cell wall synthesis by blocking peptidoglycan cross-linking.

Question 11

Which of the following is a real-world example of microbial antagonism?

Accepted Answer

Normal microbiota outcompeting pathogens for nutrients in the human gut.

Question 12

Which of the following statements about viruses is correct?

Accepted Answer

Viruses require a host cell to replicate.

Question 13

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

Accepted Answer

Presence of an outer membrane containing lipopolysaccharide (LPS)

Question 14

A patient is diagnosed with tuberculosis. Which of the following staining techniques would be most useful for confirming the presence of Mycobacterium tuberculosis in a sputum sample?

Accepted Answer

Acid-fast stain

Question 15

Which of the following best describes the function of siderophores produced by bacteria?

Accepted Answer

They facilitate the uptake of iron from the environment.

Question 16

Which of the following is an example of a selective medium?

Accepted Answer

MacConkey agar

Question 17

Which of the following statements about the endosymbiotic theory is supported by evidence?

Accepted Answer

Mitochondria and chloroplasts contain their own circular DNA similar to bacteria.

Question 18

A hospital is experiencing an outbreak of a new infectious disease. Which of the following best describes an emerging infectious disease?

Accepted Answer

A disease that is newly identified or increasing in incidence.

Question 19

Which of the following best explains why misuse of antibiotics can lead to antibiotic resistance?

Accepted Answer

Misuse selects for bacteria with resistance genes, allowing them to survive and multiply.

Question 20

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

Accepted Answer

Staphylococcus aureus

MBY161 Microbiology Study Guide: Core Concepts and Course Structure

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