Q: Which equation best represents the percentage of energy provided by gut microbes, if total daily energy intake is $$E_{total}$$ and energy from microbial fermentation is $$E_{microbes}$$?

$$\frac{E_{microbes}}{E_{total}} \times 100$$

Question 1

Which of the following best describes the human microbiome?

Accepted Answer

The genome of all bacteria, viruses, and tiny eukaryotes living in close relationship with the human host.

Question 2

A baby born via cesarean section is at increased risk for which of the following, compared to a vaginally delivered baby?

Accepted Answer

Allergic rhinitis, asthma, and celiac disease

Question 3

Which of the following is a primary function of gut microbiota in human health?

Accepted Answer

Synthesis of short-chain fatty acids (SCFAs) that nourish intestinal cells

Question 4

Which method is commonly used to distinguish different types of bacteria in a microbiome sample?

Accepted Answer

16S rRNA sequencing

Question 5

A diverse diet rich in fiber is associated with which of the following effects on the gut microbiome?

Accepted Answer

Increased microbial diversity

Question 6

Which of the following best explains why breastfed infants may have a healthier microbiome than formula-fed infants?

Accepted Answer

Breast milk contains oligosaccharides that only bacteria can digest, supporting beneficial microbes.

Question 7

Which of the following environmental factors is NOT known to impact the composition of the gut microbiome?

Accepted Answer

Blood type

Question 8

Obesity is associated with which change in the gut microbiome?

Accepted Answer

Increased Firmicutes and decreased Bacteroidetes

Question 9

Which of the following is a plausible outcome of broad-spectrum antibiotic use?

Accepted Answer

Disruption of gut microbiota and increased risk of Clostridium difficile infection

Question 10

A fecal microbiota transplant (FMT) is most commonly used to treat which condition?

Accepted Answer

Clostridium difficile-associated diarrhea

Question 11

Which of the following best describes the relationship between humans and their microbiota?

Accepted Answer

Symbiotic

Question 12

Which of the following is a recommended strategy for supporting a healthy microbiome?

Accepted Answer

Eating a variety of fiber-rich fruits and vegetables

Question 13

Which of the following statements about probiotics and prebiotics is correct?

Accepted Answer

Probiotics are live microorganisms, while prebiotics are substances that promote their growth.

Question 14

Which equation best represents the percentage of energy provided by gut microbes, if total daily energy intake is $$E_{total}$$ and energy from microbial fermentation is $$E_{microbes}$$?

Accepted Answer

$$\frac{E_{microbes}}{E_{total}} 	imes 100$$

Question 15

A researcher finds that children in rural environments have higher levels of short-chain fatty acids (SCFAs) in their feces compared to urban children. What is the most likely explanation?

Accepted Answer

Rural children consume more fiber-rich diets, supporting SCFA-producing bacteria.

Question 16

Which of the following is a direct effect of fermentation by gut bacteria?

Accepted Answer

Lowering the pH of the gut environment

Question 17

Which of the following best explains why exposure to pets and farm animals is beneficial for microbiome health?

Accepted Answer

It increases exposure to a wider variety of microbes, supporting microbial diversity.

Question 18

Which of the following is a plausible consequence of a loss of microbial diversity in the gut?

Accepted Answer

Increased risk of obesity, allergies, and autoimmune diseases

Question 19

Which of the following best describes the impact of artificial sweeteners on the gut microbiome?

Accepted Answer

They can alter the microbiome and are associated with weight gain.

The Human Microbiome: Nutrition, Health, and Disease

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