Question 1

Which of the following best describes an opportunistic pathogen?

Accepted Answer

A microbe that only causes disease when the host's immune defenses are compromised or when it enters an unusual site.

Question 2

Which of the following is NOT a typical reservoir for human pathogens?

Accepted Answer

Sterile surgical instruments

Question 3

A patient develops a bacterial infection after taking broad-spectrum antibiotics, which disrupted their normal microbiota. Which term best describes the bacteria responsible for this infection?

Accepted Answer

Opportunistic pathogen

Question 4

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

Accepted Answer

They require that the suspected pathogen be isolated and grown in pure culture.

Question 5

Which of the following is a key difference between exotoxins and endotoxins?

Accepted Answer

Exotoxins are proteins secreted by bacteria, while endotoxins are lipids released from the outer membrane of Gram-negative bacteria upon cell death.

Question 6

Which of the following best describes the process of binary fission in prokaryotes?

Accepted Answer

A parent cell divides into two genetically identical daughter cells.

Question 7

Which of the following genera is known for producing endospores?

Accepted Answer

Bacillus

Question 8

A patient presents with symptoms of tuberculosis. Which test would be most appropriate to confirm infection with Mycobacterium tuberculosis?

Accepted Answer

Acid-fast stain

Question 9

Which of the following is a distinguishing feature of Cyanobacteria?

Accepted Answer

They perform oxygenic photosynthesis and have structures similar to chloroplasts.

Question 10

Which of the following best describes the arrangement of Staphylococcus cells?

Accepted Answer

Clusters

Question 11

Which of the following is a disease caused by Streptococcus pyogenes?

Accepted Answer

Strep throat

Question 12

Which of the following is a correct pairing of a proteobacteria group and a representative genus or disease?

Accepted Answer

Beta Proteobacteria – Neisseria

Question 13

Which of the following statements about the life cycle of Bdellovibrio (a Delta Proteobacteria) is correct?

Accepted Answer

It invades and replicates inside other bacteria.

Question 14

Which of the following is a key difference between Bacteroides and enteric bacteria such as E. coli?

Accepted Answer

Bacteroides are strict anaerobes, while E. coli are facultative anaerobes.

Question 15

A patient is diagnosed with cholera. Which group of Proteobacteria does the causative agent belong to?

Accepted Answer

Gamma Proteobacteria

Question 16

Which of the following is an example of a sign, rather than a symptom, of infectious disease?

Accepted Answer

Fever of $$38.5^\circC$$

Question 17

Which of the following factors would most likely increase the virulence of a bacterial pathogen?

Accepted Answer

Acquisition of genes encoding for exotoxins

Question 18

A hospital outbreak is traced to a contaminated water source. Which method of disease transmission does this represent?

Accepted Answer

Vehicle transmission

Question 19

Which of the following best describes the relationship between Rhizobium and leguminous plants?

Accepted Answer

Mutualism

Question 20

A microbiologist observes a bacterium that divides by forming a small outgrowth that eventually detaches. Which reproductive method is being observed?

Accepted Answer

Budding

Microbiology Study Notes: Infectious Disease, Epidemiology, and Prokaryotes

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