HESI / TEAS Science Questions Exam Study Guide
2026 PDF for Nursing and Allied Health Students |
Biology, Anatomy & Physiology, Chemistry,
Microbiology, Genetics, Scientific Reasoning, and
Lab Skills | Comprehensive Science Exam
Preparation to Strengthen Understanding,
Analytical Thinking, and HESI / TEAS Test
Performance
, Question 1: Which part of the cell is primarily responsible for energy production?
A) Nucleus
B) Ribosome
C) Mitochondria
D) Endoplasmic Reticulum
Correct Option: C) Mitochondria
Rationale:
Mitochondria are known as the "powerhouses" of the cell because they produce
adenosine triphosphate (ATP) through cellular respiration. This process is essential for
converting the energy stored in nutrients into a form that cells can use. While the
nucleus controls cellular activities and the ribosome is responsible for protein
synthesis, the endoplasmic reticulum serves as a site for lipid and protein synthesis but
does not produce energy.
Question 2: What is the primary function of the large intestine?
A) Absorption of nutrients
B) Reabsorption of water
C) Digestion of proteins
D) Synthesis of vitamins
Correct Option: B) Reabsorption of water
Rationale:
The primary function of the large intestine, or colon, is to absorb water and electrolytes
from indigestible food matter and to transmit the useless waste material from the body.
While some vitamins are synthesized by gut bacteria in the large intestine, the main role
revolves around water reabsorption, which is crucial for maintaining hydration and
electrolyte balance in the body.
Question 3: Which of the following is a characteristic of acids?
A) They have a pH greater than 7.
B) They turn litmus paper blue.
C) They donate protons (H+) in a solution.
D) They feel slippery to the touch.
Correct Option: C) They donate protons (H+) in a solution.
Rationale:
Acids are defined as substances that donate protons (H+) to a solution, which lowers
the pH, making it below 7. They typically have a sour taste and can turn litmus paper
2026 PDF for Nursing and Allied Health Students |
Biology, Anatomy & Physiology, Chemistry,
Microbiology, Genetics, Scientific Reasoning, and
Lab Skills | Comprehensive Science Exam
Preparation to Strengthen Understanding,
Analytical Thinking, and HESI / TEAS Test
Performance
, Question 1: Which part of the cell is primarily responsible for energy production?
A) Nucleus
B) Ribosome
C) Mitochondria
D) Endoplasmic Reticulum
Correct Option: C) Mitochondria
Rationale:
Mitochondria are known as the "powerhouses" of the cell because they produce
adenosine triphosphate (ATP) through cellular respiration. This process is essential for
converting the energy stored in nutrients into a form that cells can use. While the
nucleus controls cellular activities and the ribosome is responsible for protein
synthesis, the endoplasmic reticulum serves as a site for lipid and protein synthesis but
does not produce energy.
Question 2: What is the primary function of the large intestine?
A) Absorption of nutrients
B) Reabsorption of water
C) Digestion of proteins
D) Synthesis of vitamins
Correct Option: B) Reabsorption of water
Rationale:
The primary function of the large intestine, or colon, is to absorb water and electrolytes
from indigestible food matter and to transmit the useless waste material from the body.
While some vitamins are synthesized by gut bacteria in the large intestine, the main role
revolves around water reabsorption, which is crucial for maintaining hydration and
electrolyte balance in the body.
Question 3: Which of the following is a characteristic of acids?
A) They have a pH greater than 7.
B) They turn litmus paper blue.
C) They donate protons (H+) in a solution.
D) They feel slippery to the touch.
Correct Option: C) They donate protons (H+) in a solution.
Rationale:
Acids are defined as substances that donate protons (H+) to a solution, which lowers
the pH, making it below 7. They typically have a sour taste and can turn litmus paper
