Question 1

Which of the following best describes the human microbiome?

Accepted Answer

All microorganisms, including bacteria, viruses, fungi, and archaea, living in a specific environment of the human body.

Question 2

Which method is commonly used to identify and compare bacteria present within a given sample by targeting a universal gene?

Accepted Answer

16S rRNA gene sequencing

Question 3

A researcher is comparing the gut microbiomes of children from the US, Malawi, and the Amazon. What is a key finding from such studies?

Accepted Answer

US children have a distinctly different gut microbiome compared to Malawian and Amerindian children.

Question 4

Which of the following is NOT a benefit provided by the human microbiome?

Accepted Answer

Direct production of human hormones

Question 5

Dysbiosis of the gut microbiome has been linked to which of the following diseases?

Accepted Answer

Obesity, IBD, diabetes, allergies, and mental health disorders

Question 6

The gut-brain axis refers to:

Accepted Answer

Bidirectional communication between the gut microbiome and the brain, influencing mood and behavior.

Question 7

Which of the following statements about the Earth Microbiome Project is correct?

Accepted Answer

It aims to systematically characterize global microbial diversity across various environments.

Question 8

Why is the 16S rRNA gene commonly used in bacterial identification?

Accepted Answer

It contains both conserved and variable regions, allowing for universal amplification and species differentiation.

Question 9

Which of the following best explains why soil and sediment samples often show higher bacterial diversity than host-associated samples?

Accepted Answer

Soil and sediments provide a wide range of microenvironments and nutrients, supporting diverse microbial communities.

Question 10

Corals are classified as:

Accepted Answer

Animals composed of colonies of invertebrate polyps.

Question 11

Which of the following is a function of coral reefs?

Accepted Answer

They provide habitat for thousands of species and protect shorelines.

Question 12

The DDAM model in coral reef ecology refers to the interaction of:

Accepted Answer

Dissolved Organic Carbon, Disease, Algae, and Microbes

Question 13

A scientist is analyzing the microbiome of different body sites. Which observation is most consistent with current research?

Accepted Answer

Distinct bacterial communities are found at different body sites such as skin, gut, and oral cavity.

Question 14

Which of the following is a plausible explanation for the observed differences in gut microbiome composition between US residents and rural populations in Malawi and the Amazon?

Accepted Answer

Differences in diet, environment, and lifestyle influence the gut microbiome.

Question 15

Which of the following best describes the role of the microbiome in immune system development?

Accepted Answer

The microbiome helps train and regulate the immune system, especially early in life.

Question 16

Which of the following is a real-world application of metagenomics in microbiome research?

Accepted Answer

Identifying unknown pathogens in a hospital outbreak using $$	ext{DNA}$$ sequencing.

Question 17

Which of the following is a correct statement about the functional maturation of the gut microbiome in children?

Accepted Answer

Shared features of functional maturation are observed during the first three years of life across different populations.

Question 18

Which of the following best explains why coral reefs are considered important for coastal communities?

Accepted Answer

They provide a source of food, protect shorelines, and support tourism.

Question 19

Which of the following is a plausible consequence of coral microbiome dysbiosis?

Accepted Answer

Greater susceptibility to disease and reef decline.

Question 20

A principal component analysis (PCA) plot of microbiome samples from different environments shows distinct clusters. What does this indicate?

Accepted Answer

Microbial communities differ based on their environment.

Bacteria and the Microbiome: Diversity, Function, and Human & Environmental Health

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