ATI TEAS 2026 Complete Exam
ATI TEAS 2026 Complete Exam Package
200 Questions & Answers | Reading, Science,
Math, English and Language Usage | 2026
Updated
___________________________________________________________________
_____________
Name: Date: Score: _____ / 200
________________________ ________________________
___________________________________________________________________
_____________
Instructions:
This exam contains 200 multiple-choice questions numbered 1-200. Each question
has four answer choices (A, B, C, D). Select the ONE best answer for each question.
Correct answers are highlighted in green. Read each question carefully before
answering. There is no penalty for guessing.
___________________________________________________________________
_____________
The human microbiome, the collection of trillions of microorganisms
residing in and on the human body, has emerged as one of the most
fascinating areas of biomedical research in the 21st century. These
microorganisms, which include bacteria, fungi, viruses, and archaea,
outnumber human cells by a ratio of approximately 1.3 to 1. The majority of
these organisms are found in the gastrointestinal tract, particularly the large
intestine, where they play crucial roles in digestion, immune function, and
even mental health. Research published in 2023 demonstrated that the gut
microbiome produces neurotransmitters such as serotonin and gamma-
aminobutyric acid (GABA), which directly influence mood and cognitive
function. Furthermore, studies have shown that individuals with certain
psychiatric disorders, including depression and anxiety, often exhibit distinct
alterations in their gut microbial composition compared to healthy controls.
Despite these promising findings, scientists caution that the relationship
between the microbiome and human health is complex and not fully
understood. Factors such as diet, antibiotics, stress, and environmental
exposures can significantly alter the composition of the microbiome,
sometimes with lasting effects. The field of microbiome therapeutics is
rapidly evolving, with researchers exploring probiotics, prebiotics, and even
fecal microbiota transplantation as potential treatments for a range of
conditions.
1. What is the main idea of this passage?
A) Antibiotics are harmful to the gut microbiome and should be avoided.
Page 1 of 35
, ATI TEAS 2026 Complete Exam
B) The human microbiome plays a significant role in various aspects of health,
and research continues to explore its complexities.
C) Fecal microbiota transplantation is the most effective treatment for psychiatric
disorders.
D) The gastrointestinal tract contains more human cells than microorganisms.
The passage discusses the microbiome's roles in digestion, immunity, and mental
health, while acknowledging the complexity of the research. This captures the
overarching theme better than any single detail.
2. According to the passage, what is the approximate ratio of microorganisms to
human cells in the body?
A) 1:1 B) 1.3 to 1
C) 3 to 1 D) 10 to 1
The passage explicitly states that microorganisms outnumber human cells by
approximately 1.3 to 1.
3. Which of the following statements is supported by the passage?
A) Serotonin is produced exclusively by the human brain.
B) Diet has no significant impact on the composition of the gut microbiome.
C) Individuals with depression may have different gut microbial compositions
than healthy individuals.
D) All alterations to the microbiome are permanent and irreversible.
The passage states that individuals with depression and anxiety often exhibit distinct
alterations in their gut microbial composition compared to healthy controls.
4. The author mentions neurotransmitters in the passage primarily to:
A) Demonstrate that microorganisms in the gut can influence brain function
and mental health.
B) Argue that serotonin supplements are unnecessary for most people.
C) Prove that psychiatric disorders are caused solely by gut bacteria.
D) Contrast the functions of serotonin and GABA in the human body.
The author introduces neurotransmitters (serotonin and GABA) to support the claim
that gut microorganisms directly influence mood and cognitive function.
5. What can be inferred from the passage about the current state of microbiome
research?
A) Scientists have completely mapped all microorganisms in the human body.
B) Microbiome research has reached its final conclusions.
C) The field is still developing, and much remains to be discovered about the
microbiome.
D) Probiotics have been proven to cure all microbiome-related conditions.
The passage states the relationship is complex and not fully understood, and
describes the field as rapidly evolving, suggesting there is still much to learn.
Climate change is fundamentally altering the world's oceans at an
unprecedented rate. Ocean acidification, often called the evil twin of global
warming, occurs when seawater absorbs carbon dioxide from the
Page 2 of 35
, ATI TEAS 2026 Complete Exam
atmosphere, lowering the ocean's pH. Since the beginning of the Industrial
Revolution, the average pH of ocean surface waters has decreased by
approximately 0.1 units, representing a 26 percent increase in acidity. While
this may sound modest, it has profound implications for marine ecosystems,
particularly organisms that build calcium carbonate shells or skeletons, such
as coral reefs, oysters, clams, and certain types of plankton. Coral reefs,
which support roughly 25 percent of all marine species despite covering less
than one percent of the ocean floor, are especially vulnerable. Mass
bleaching events, triggered by rising water temperatures combined with
acidification, have devastated reefs worldwide. The Great Barrier Reef, for
example, experienced unprecedented back-to-back bleaching events in 2016
and 2017, resulting in the death of approximately 50 percent of its coral in
the northern section. Scientists project that if current trends continue, ocean
acidity could increase by 150 percent by the end of this century, threatening
not only marine biodiversity but also the livelihoods of hundreds of millions
of people who depend on the ocean for food and income.
6. Which of the following best describes the organization of this passage?
A) A list of marine species affected by climate change
B) A cause-and-effect explanation of ocean acidification and its impacts
C) A chronological history of ocean temperature changes
D) A comparison of different theories about coral reef decline
The passage explains the cause of ocean acidification (CO2 absorption), then
details its effects on marine organisms and ecosystems, making it a cause-and-effect
structure.
7. According to the passage, what percentage of marine species are supported by
coral reefs?
A) Approximately 1 percent B) Approximately 26 percent
C) Approximately 25 percent D) Approximately 50 percent
The passage states that coral reefs support roughly 25 percent of all marine species.
8. The phrase 'evil twin of global warming' is used by the author to:
A) Suggest that ocean acidification is a separate but equally serious problem.
B) Argue that ocean acidification is a more dangerous threat than global warming.
C) Indicate that ocean acidification and global warming are the same phenomenon.
D) Minimize the significance of ocean acidification relative to global warming.
The phrase suggests ocean acidification is a parallel and equally concerning
problem linked to the same underlying cause (CO2 emissions), not that it is the
same phenomenon.
9. What evidence does the author provide to support the claim that coral reefs are
especially vulnerable?
A) A theoretical model predicting future reef collapse
B) The example of the Great Barrier Reef experiencing mass bleaching events
C) A survey of marine biologists about reef health
D) A comparison of reef coverage from different decades
Page 3 of 35
, ATI TEAS 2026 Complete Exam
The author provides the specific example of the Great Barrier Reef's back-to-back
bleaching events in 2016-2017, which killed approximately 50 percent of coral in
the northern section.
10. Based on the passage, which of the following would most likely be affected by
continued ocean acidification?
A) Deep-sea volcanic vents B) Organisms that build calcium
carbonate shells
C) Marine mammals such as whales and D) Organisms that live exclusively in
dolphins freshwater ecosystems
The passage specifically identifies organisms that build calcium carbonate shells or
skeletons as being particularly vulnerable to ocean acidification.
The invention of the printing press by Johannes Gutenberg around 1440
revolutionized the way information was disseminated across Europe and,
eventually, the world. Before the printing press, books were copied by hand,
a laborious and time-consuming process that made them expensive and
accessible only to the wealthy elite. Monasteries served as the primary
centers of book production, with monks meticulously transcribing texts one
page at a time. Gutenberg's introduction of movable type changed
everything. By creating individual, reusable metal letters that could be
rearranged to form different words and pages, Gutenberg made it possible to
produce multiple copies of a text quickly and relatively inexpensively. The
Gutenberg Bible, completed around 1455, is often cited as the first major
book printed using this technology. Within 50 years of its invention, an
estimated 20 million volumes had been printed in Europe. The consequences
of this technological breakthrough were far-reaching. It facilitated the
spread of Renaissance ideas, contributed to the Protestant Reformation by
allowing Martin Luther's writings to reach a wide audience, and promoted
the standardization of vernacular languages. Some historians argue that the
printing press was as transformative as the internet in its impact on human
communication and knowledge sharing.
11. What is the primary purpose of this passage?
A) To compare different methods of book production throughout history
B) To describe the impact of the printing press on European society
C) To argue that the internet is less important than the printing press
D) To provide a biography of Johannes Gutenberg's life
The passage focuses on how the printing press changed information dissemination
and its broad societal consequences, including the spread of ideas and religious
reform.
12. According to the passage, what was the primary method of book production
before the printing press?
A) Movable type printing in Asia B) Hand-copying by monks in
monasteries
Page 4 of 35
ATI TEAS 2026 Complete Exam Package
200 Questions & Answers | Reading, Science,
Math, English and Language Usage | 2026
Updated
___________________________________________________________________
_____________
Name: Date: Score: _____ / 200
________________________ ________________________
___________________________________________________________________
_____________
Instructions:
This exam contains 200 multiple-choice questions numbered 1-200. Each question
has four answer choices (A, B, C, D). Select the ONE best answer for each question.
Correct answers are highlighted in green. Read each question carefully before
answering. There is no penalty for guessing.
___________________________________________________________________
_____________
The human microbiome, the collection of trillions of microorganisms
residing in and on the human body, has emerged as one of the most
fascinating areas of biomedical research in the 21st century. These
microorganisms, which include bacteria, fungi, viruses, and archaea,
outnumber human cells by a ratio of approximately 1.3 to 1. The majority of
these organisms are found in the gastrointestinal tract, particularly the large
intestine, where they play crucial roles in digestion, immune function, and
even mental health. Research published in 2023 demonstrated that the gut
microbiome produces neurotransmitters such as serotonin and gamma-
aminobutyric acid (GABA), which directly influence mood and cognitive
function. Furthermore, studies have shown that individuals with certain
psychiatric disorders, including depression and anxiety, often exhibit distinct
alterations in their gut microbial composition compared to healthy controls.
Despite these promising findings, scientists caution that the relationship
between the microbiome and human health is complex and not fully
understood. Factors such as diet, antibiotics, stress, and environmental
exposures can significantly alter the composition of the microbiome,
sometimes with lasting effects. The field of microbiome therapeutics is
rapidly evolving, with researchers exploring probiotics, prebiotics, and even
fecal microbiota transplantation as potential treatments for a range of
conditions.
1. What is the main idea of this passage?
A) Antibiotics are harmful to the gut microbiome and should be avoided.
Page 1 of 35
, ATI TEAS 2026 Complete Exam
B) The human microbiome plays a significant role in various aspects of health,
and research continues to explore its complexities.
C) Fecal microbiota transplantation is the most effective treatment for psychiatric
disorders.
D) The gastrointestinal tract contains more human cells than microorganisms.
The passage discusses the microbiome's roles in digestion, immunity, and mental
health, while acknowledging the complexity of the research. This captures the
overarching theme better than any single detail.
2. According to the passage, what is the approximate ratio of microorganisms to
human cells in the body?
A) 1:1 B) 1.3 to 1
C) 3 to 1 D) 10 to 1
The passage explicitly states that microorganisms outnumber human cells by
approximately 1.3 to 1.
3. Which of the following statements is supported by the passage?
A) Serotonin is produced exclusively by the human brain.
B) Diet has no significant impact on the composition of the gut microbiome.
C) Individuals with depression may have different gut microbial compositions
than healthy individuals.
D) All alterations to the microbiome are permanent and irreversible.
The passage states that individuals with depression and anxiety often exhibit distinct
alterations in their gut microbial composition compared to healthy controls.
4. The author mentions neurotransmitters in the passage primarily to:
A) Demonstrate that microorganisms in the gut can influence brain function
and mental health.
B) Argue that serotonin supplements are unnecessary for most people.
C) Prove that psychiatric disorders are caused solely by gut bacteria.
D) Contrast the functions of serotonin and GABA in the human body.
The author introduces neurotransmitters (serotonin and GABA) to support the claim
that gut microorganisms directly influence mood and cognitive function.
5. What can be inferred from the passage about the current state of microbiome
research?
A) Scientists have completely mapped all microorganisms in the human body.
B) Microbiome research has reached its final conclusions.
C) The field is still developing, and much remains to be discovered about the
microbiome.
D) Probiotics have been proven to cure all microbiome-related conditions.
The passage states the relationship is complex and not fully understood, and
describes the field as rapidly evolving, suggesting there is still much to learn.
Climate change is fundamentally altering the world's oceans at an
unprecedented rate. Ocean acidification, often called the evil twin of global
warming, occurs when seawater absorbs carbon dioxide from the
Page 2 of 35
, ATI TEAS 2026 Complete Exam
atmosphere, lowering the ocean's pH. Since the beginning of the Industrial
Revolution, the average pH of ocean surface waters has decreased by
approximately 0.1 units, representing a 26 percent increase in acidity. While
this may sound modest, it has profound implications for marine ecosystems,
particularly organisms that build calcium carbonate shells or skeletons, such
as coral reefs, oysters, clams, and certain types of plankton. Coral reefs,
which support roughly 25 percent of all marine species despite covering less
than one percent of the ocean floor, are especially vulnerable. Mass
bleaching events, triggered by rising water temperatures combined with
acidification, have devastated reefs worldwide. The Great Barrier Reef, for
example, experienced unprecedented back-to-back bleaching events in 2016
and 2017, resulting in the death of approximately 50 percent of its coral in
the northern section. Scientists project that if current trends continue, ocean
acidity could increase by 150 percent by the end of this century, threatening
not only marine biodiversity but also the livelihoods of hundreds of millions
of people who depend on the ocean for food and income.
6. Which of the following best describes the organization of this passage?
A) A list of marine species affected by climate change
B) A cause-and-effect explanation of ocean acidification and its impacts
C) A chronological history of ocean temperature changes
D) A comparison of different theories about coral reef decline
The passage explains the cause of ocean acidification (CO2 absorption), then
details its effects on marine organisms and ecosystems, making it a cause-and-effect
structure.
7. According to the passage, what percentage of marine species are supported by
coral reefs?
A) Approximately 1 percent B) Approximately 26 percent
C) Approximately 25 percent D) Approximately 50 percent
The passage states that coral reefs support roughly 25 percent of all marine species.
8. The phrase 'evil twin of global warming' is used by the author to:
A) Suggest that ocean acidification is a separate but equally serious problem.
B) Argue that ocean acidification is a more dangerous threat than global warming.
C) Indicate that ocean acidification and global warming are the same phenomenon.
D) Minimize the significance of ocean acidification relative to global warming.
The phrase suggests ocean acidification is a parallel and equally concerning
problem linked to the same underlying cause (CO2 emissions), not that it is the
same phenomenon.
9. What evidence does the author provide to support the claim that coral reefs are
especially vulnerable?
A) A theoretical model predicting future reef collapse
B) The example of the Great Barrier Reef experiencing mass bleaching events
C) A survey of marine biologists about reef health
D) A comparison of reef coverage from different decades
Page 3 of 35
, ATI TEAS 2026 Complete Exam
The author provides the specific example of the Great Barrier Reef's back-to-back
bleaching events in 2016-2017, which killed approximately 50 percent of coral in
the northern section.
10. Based on the passage, which of the following would most likely be affected by
continued ocean acidification?
A) Deep-sea volcanic vents B) Organisms that build calcium
carbonate shells
C) Marine mammals such as whales and D) Organisms that live exclusively in
dolphins freshwater ecosystems
The passage specifically identifies organisms that build calcium carbonate shells or
skeletons as being particularly vulnerable to ocean acidification.
The invention of the printing press by Johannes Gutenberg around 1440
revolutionized the way information was disseminated across Europe and,
eventually, the world. Before the printing press, books were copied by hand,
a laborious and time-consuming process that made them expensive and
accessible only to the wealthy elite. Monasteries served as the primary
centers of book production, with monks meticulously transcribing texts one
page at a time. Gutenberg's introduction of movable type changed
everything. By creating individual, reusable metal letters that could be
rearranged to form different words and pages, Gutenberg made it possible to
produce multiple copies of a text quickly and relatively inexpensively. The
Gutenberg Bible, completed around 1455, is often cited as the first major
book printed using this technology. Within 50 years of its invention, an
estimated 20 million volumes had been printed in Europe. The consequences
of this technological breakthrough were far-reaching. It facilitated the
spread of Renaissance ideas, contributed to the Protestant Reformation by
allowing Martin Luther's writings to reach a wide audience, and promoted
the standardization of vernacular languages. Some historians argue that the
printing press was as transformative as the internet in its impact on human
communication and knowledge sharing.
11. What is the primary purpose of this passage?
A) To compare different methods of book production throughout history
B) To describe the impact of the printing press on European society
C) To argue that the internet is less important than the printing press
D) To provide a biography of Johannes Gutenberg's life
The passage focuses on how the printing press changed information dissemination
and its broad societal consequences, including the spread of ideas and religious
reform.
12. According to the passage, what was the primary method of book production
before the printing press?
A) Movable type printing in Asia B) Hand-copying by monks in
monasteries
Page 4 of 35
