Question 1

Which of the following best describes the human microbiome?

Accepted Answer

The collection of microorganisms and their genetic material living in and on the human body.

Question 2

Which two bacterial phyla dominate the gut microbiota in healthy adults?

Accepted Answer

Firmicutes and Bacteroidetes

Question 3

What is the primary danger associated with 'leaky gut' (increased intestinal permeability)?

Accepted Answer

It allows bacteria, toxins, and undigested food particles to enter the bloodstream, triggering chronic systemic inflammation.

Question 4

Which of the following is a critical function of short-chain fatty acids (SCFAs) produced by gut bacteria?

Accepted Answer

They serve as the primary energy source for colon cells and have anti-inflammatory properties.

Question 5

A patient is prescribed a broad-spectrum antibiotic. Which of the following is a potential risk associated with this treatment regarding the gut microbiome?

Accepted Answer

Overgrowth of opportunistic pathogens such as Clostridioides difficile.

Question 6

Which neurotransmitter is primarily synthesized in the gut and is involved in mood regulation?

Accepted Answer

Serotonin

Question 7

According to the microbiome hypothesis, what is a key factor in reducing the risk of allergies and autoimmune diseases in children?

Accepted Answer

Early exposure to a diverse community of beneficial microbes.

Question 8

Which of the following best explains how a high-fiber diet supports gut health?

Accepted Answer

It provides fuel for beneficial bacteria, leading to the production of SCFAs.

Question 9

Which pathway is NOT a primary route by which psychobiotics communicate with the brain?

Accepted Answer

Direct electrical impulses through the spinal cord

Question 10

A child delivered by Cesarean section is at increased risk for which of the following, according to current microbiome research?

Accepted Answer

Higher risk of asthma due to altered initial gut microbiota composition.

Question 11

Which of the following statements about dysbiosis is CORRECT?

Accepted Answer

It is associated with chronic inflammation and increased risk of autoimmune diseases.

Question 12

Which of the following is a mechanism by which beneficial gut microbes help prevent colonization by pathogens?

Accepted Answer

They compete for nutrients and space, providing colonization resistance.

Question 13

Which hormone is released in response to SCFAs and signals satiety to the brain?

Accepted Answer

GLP-1 (Glucagon-like peptide-1)

Question 14

A patient with chronic stress and poor diet develops symptoms of depression and digestive issues. Which concept best explains the link between these symptoms?

Accepted Answer

Microbiota-gut-brain axis

Question 15

Which of the following is a risk associated with Fecal Microbiota Transplant (FMT)?

Accepted Answer

Transfer of microbes that may alter the recipient’s metabolism or behavior.

Question 16

Which of the following best describes the role of regulatory T cells (Tregs) in immune training by the microbiome?

Accepted Answer

They prevent the immune system from overreacting to harmless substances.

Question 17

Which of the following is a plausible outcome of a diet high in sugar and saturated fats on the gut microbiota?

Accepted Answer

Reduced microbial diversity and increased pro-inflammatory species.

Question 18

Which of the following is TRUE regarding the synthesis of vitamins by gut bacteria?

Accepted Answer

Gut bacteria are the sole producers of Vitamin B12 in the human body.

Question 19

Which of the following best explains why a diverse gut microbiota is associated with a lean phenotype?

Accepted Answer

It extracts fewer calories from food and increases satiety hormones.

Question 20

Which of the following is a real-world example of the gut-brain axis influencing behavior?

Accepted Answer

Transplanting gut bacteria from humans with depression into mice causes depressive-like behaviors in the mice.

The Human Microbiome: Structure, Function, and Clinical Relevance

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