Question 1

Which of the following best describes the relationship of mutualism between normal microbiota and the human host?

Accepted Answer

Both organisms benefit from the relationship.

Question 2

Which factor does NOT directly determine the distribution and composition of normal (resident) microbiota in the human body?

Accepted Answer

The presence of viral infections

Question 3

Why is microbial antagonism (competitive exclusion) important for host protection?

Accepted Answer

It inhibits the growth of invading microbes by competing for nutrients and producing harmful substances.

Question 4

Which of the following statements about transient microbiota is TRUE?

Accepted Answer

Transient microbiota may be present for days, weeks, or months but cannot persist due to competition and host defenses.

Question 5

Which of the following is an example of a zoonosis?

Accepted Answer

Lyme disease acquired from ticks that feed on rodents

Question 6

A patient develops an infection after a surgical procedure. This infection is best classified as:

Accepted Answer

Iatrogenic infection

Question 7

Which portal of entry is most commonly used by respiratory pathogens?

Accepted Answer

Mucous membranes of the respiratory tract

Question 8

What does the term $$ID_{50}$$ represent in the context of infectious diseases?

Accepted Answer

The infectious dose required to infect 50% of a sample population

Question 9

Which of the following is NOT a typical portal of entry for pathogens?

Accepted Answer

Liver

Question 10

A bacterial pathogen is unable to produce attachment proteins (adhesins). What is the most likely consequence?

Accepted Answer

It will be unable to establish infection and become avirulent.

Question 11

Which of the following is a function of biofilms in microbial pathogenesis?

Accepted Answer

Biofilms allow communities of microbes to share nutrients and resist host defenses.

Question 12

Which of the following is a reason why not all contaminations result in infection?

Accepted Answer

The host's external defenses may prevent the microbe from multiplying and establishing itself.

Question 13

Which of the following is NOT a way that normal microbiota protect the host?

Accepted Answer

Increasing the host's susceptibility to infection

Question 14

Which of the following is a correct definition of pathogenesis?

Accepted Answer

The development of disease

Question 15

Which of the following is a plausible reason why animal reservoirs are involved in more diseases than human reservoirs?

Accepted Answer

Humans are usually dead-end hosts for many zoonotic pathogens, while animals can maintain and transmit pathogens.

Question 16

Which of the following is NOT a type of symbiotic relationship between normal microbiota and the host?

Accepted Answer

Antagonism

Question 17

Which of the following is a characteristic of resident (normal) microbiota?

Accepted Answer

They permanently colonize the host and do not cause disease under normal conditions.

Question 18

Which of the following is a plausible reason why absolute commensalism is difficult to prove?

Accepted Answer

There may be subtle or undetectable effects on the host that are not easily measured.

Question 19

Which of the following is NOT a reservoir of infection?

Accepted Answer

Airborne droplets less than 1 meter

Question 20

Which of the following statements about human carriers is TRUE?

Accepted Answer

Human carriers can be asymptomatic and still infect others.

Infection, Infectious Diseases, and Epidemiology (Chapter 14) – Microbiology Study Notes

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