Question 1

Which of the following best explains why prokaryotes are considered ubiquitous in nature?

Accepted Answer

They are extremely resilient and adaptable, allowing them to thrive in diverse habitats.

Question 2

Which ecological association describes a relationship where one population harms another but remains unaffected itself?

Accepted Answer

Amensalism

Question 3

A patient presents with a chronic cough, fever, and blood-tinged sputum after returning from a country with high tuberculosis prevalence. Which diagnostic test is most appropriate to confirm tuberculosis?

Accepted Answer

Mantoux tuberculin skin test

Question 4

Which of the following is TRUE regarding the infectious dose of Mycobacterium tuberculosis?

Accepted Answer

The infectious dose is only 10 cells.

Question 5

What is the primary mechanism by which Vibrio cholerae causes severe dehydration in infected individuals?

Accepted Answer

Release of cholera toxin that causes electrolyte and water loss through secretory diarrhea

Question 6

Which prevention strategy is most effective in reducing the risk of cholera during travel to endemic regions?

Accepted Answer

Drinking and using only safe water

Question 7

Which statement about the domain Archaea is correct?

Accepted Answer

Archaeal cell walls lack peptidoglycan but may contain a structurally similar substance.

Question 8

A patient develops a bull’s eye rash and flu-like symptoms after a tick bite. Which organism is most likely responsible?

Accepted Answer

Borrelia burgdorferi

Question 9

Which of the following is a key feature of the life cycle of Chlamydia trachomatis?

Accepted Answer

Alternates between an elementary body and a reticulate body

Question 10

Which form of anthrax is considered the least dangerous and why?

Accepted Answer

Cutaneous anthrax, because it has a lower mortality rate and is treatable with antibiotics

Question 11

Which of the following best describes mutualism?

Accepted Answer

Both organisms benefit from the relationship

Question 12

What is the main reason for the emergence of multidrug-resistant tuberculosis (MDR-TB)?

Accepted Answer

Overuse and mismanagement of antibiotic therapies

Question 13

Which of the following is a characteristic of the lepromatous form of Hansen’s disease?

Accepted Answer

Deeply nodular infection causing severe disfigurement and widespread dissemination

Question 14

Which of the following statements about the human microbiome is correct?

Accepted Answer

It includes both resident and transient microbiota.

Question 15

Which process performed by prokaryotes is essential for converting atmospheric nitrogen into a form usable by plants?

Accepted Answer

Nitrogen fixation

Question 16

A patient with untreated tuberculosis develops necrotic caseous lesions in the lungs. What is the next likely step in the disease process?

Accepted Answer

Lesions heal by calcification (Ghon complex)

Question 17

Which of the following is NOT a recommended prevention tip for cholera?

Accepted Answer

Take antibiotics daily as a preventive measure

Question 18

Which of the following statements about Mycobacterium leprae is TRUE?

Accepted Answer

It is a strict parasite and the slowest growing of all bacterial species.

Question 19

Which of the following equations best represents the process of carbon fixation performed by prokaryotes?

Accepted Answer

$$CO_2 + H_2O$$ \rightarrow C_6H_{12}$$O_6$$ + $$O_2$$

Question 20

Which of the following is a plausible reason why the global prevalence of Hansen’s disease has greatly reduced?

Accepted Answer

Effective antibiotic treatment

Diversity, Structure, and Function of Prokaryotes: Microbial Relationships and Pathogenic Bacteria

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