HESI A2 SCIENCE (BIOLOGY AND CHEMISTRY) 2026
QUESTIONS WITH 100% ACCURATE ANSWERS
1. If you have a mixture of salt and water, identify the solute and the
solvent in this solution.
Water is the solute, and salt is the solvent.
Salt is the solute, and water is the solvent.
Salt and water cannot form a solution.
Both salt and water are solutes.
2. Which of the following bases is not associated with deoxyribonucleic
acid (DNA)?
Adenine
Cytosine
Uracil
Thymine
3. Catabolism is the
building energy yielding molecules
breakdown of energy-yielding molecules
4. What type of sugar is glucose classified as?
disaccharide
simple
polysaccharide
complex
,5. Describe the relationship between tissues and organs in biological
systems.
Tissues are groups of similar cells that work together to
perform specific functions, and they combine to form organs.
Tissues are the smallest units of life, while organs are larger
structures that do not have specific functions.
Tissues are individual cells that function independently, while
organs are made of different types of molecules.
Tissues are made up of organs that perform various cellular
processes.
6. All of the following statements are true regarding DNA except:
DNA strands are anti-parallel to one another
The bases in DNA are connected to one another by hydrogen
bonds
Uracil is one of the four bases
DNA contains a deoxyribose sugar, not ribose
7. Describe the significance of glucose being classified as a simple sugar
in biological systems.
Glucose being a simple sugar means it is easily absorbed and
utilized by cells for energy.
Glucose is a complex sugar that requires more time to digest.
Simple sugars are not used by cells for energy.
Glucose is a type of protein that aids in cellular structure.
8. Which part of the human skeleton does the tibia belong to?
Axial skeleton
, Cranial skeleton
Pelvic skeleton
Appendicular skeleton
9. What determines the atomic number of an element?
The mass of the element
The total number of electrons
The number of protons in the nucleus
The number of neutrons in the nucleus
10. What is formed when two or more elements are chemically combined?
mixture
solution
compound
element
11. Which base is found in deoxyribonucleic acid (DNA)?
Thymine
Uracil
Cytosine
Adenine
12. During which phase of mitosis do chromatids become individual
chromosomes?
Metaphase
Anaphase
, Prophase
13. What term describes the three-dimensional arrangement of atoms in a
molecule?
Concentration
Configuration
Composition
Conformation
14. If sodium and chlorine are combined, what type of substance is
formed, and what is its significance in biological systems?
mixture; it forms sodium chloride, which is essential for cellular
function.
solution; it forms sodium chloride, which is essential for cellular
function.
compound; it forms sodium chloride, which is essential for
cellular function.
element; it forms sodium chloride, which is essential for cellular
function.
15. Describe the role of Uracil in RNA and how it differs from Thymine in
DNA.
Uracil is a protein that helps in DNA replication.
Uracil is a sugar molecule that stabilizes RNA structure.
Uracil is a lipid that forms the cell membrane.
Uracil replaces Thymine in RNA and pairs with Adenine during
transcription.
QUESTIONS WITH 100% ACCURATE ANSWERS
1. If you have a mixture of salt and water, identify the solute and the
solvent in this solution.
Water is the solute, and salt is the solvent.
Salt is the solute, and water is the solvent.
Salt and water cannot form a solution.
Both salt and water are solutes.
2. Which of the following bases is not associated with deoxyribonucleic
acid (DNA)?
Adenine
Cytosine
Uracil
Thymine
3. Catabolism is the
building energy yielding molecules
breakdown of energy-yielding molecules
4. What type of sugar is glucose classified as?
disaccharide
simple
polysaccharide
complex
,5. Describe the relationship between tissues and organs in biological
systems.
Tissues are groups of similar cells that work together to
perform specific functions, and they combine to form organs.
Tissues are the smallest units of life, while organs are larger
structures that do not have specific functions.
Tissues are individual cells that function independently, while
organs are made of different types of molecules.
Tissues are made up of organs that perform various cellular
processes.
6. All of the following statements are true regarding DNA except:
DNA strands are anti-parallel to one another
The bases in DNA are connected to one another by hydrogen
bonds
Uracil is one of the four bases
DNA contains a deoxyribose sugar, not ribose
7. Describe the significance of glucose being classified as a simple sugar
in biological systems.
Glucose being a simple sugar means it is easily absorbed and
utilized by cells for energy.
Glucose is a complex sugar that requires more time to digest.
Simple sugars are not used by cells for energy.
Glucose is a type of protein that aids in cellular structure.
8. Which part of the human skeleton does the tibia belong to?
Axial skeleton
, Cranial skeleton
Pelvic skeleton
Appendicular skeleton
9. What determines the atomic number of an element?
The mass of the element
The total number of electrons
The number of protons in the nucleus
The number of neutrons in the nucleus
10. What is formed when two or more elements are chemically combined?
mixture
solution
compound
element
11. Which base is found in deoxyribonucleic acid (DNA)?
Thymine
Uracil
Cytosine
Adenine
12. During which phase of mitosis do chromatids become individual
chromosomes?
Metaphase
Anaphase
, Prophase
13. What term describes the three-dimensional arrangement of atoms in a
molecule?
Concentration
Configuration
Composition
Conformation
14. If sodium and chlorine are combined, what type of substance is
formed, and what is its significance in biological systems?
mixture; it forms sodium chloride, which is essential for cellular
function.
solution; it forms sodium chloride, which is essential for cellular
function.
compound; it forms sodium chloride, which is essential for
cellular function.
element; it forms sodium chloride, which is essential for cellular
function.
15. Describe the role of Uracil in RNA and how it differs from Thymine in
DNA.
Uracil is a protein that helps in DNA replication.
Uracil is a sugar molecule that stabilizes RNA structure.
Uracil is a lipid that forms the cell membrane.
Uracil replaces Thymine in RNA and pairs with Adenine during
transcription.
