HESI A2 Science Questions and
Answers | Latest Version | 2025/2026 |
Correct & Verified
What is the function of the liver?
✔✔To detoxify harmful substances and produce bile
What is the term for matter that has a definite volume but no definite shape?
✔✔Liquid
What is the term for the process where cells convert glucose and oxygen into energy?
✔✔Cellular respiration
What is the difference between prokaryotic and eukaryotic cells?
✔✔Prokaryotic cells lack a nucleus; eukaryotic cells have a nucleus
What is the name of the process that produces offspring that are genetically identical?
✔✔Asexual reproduction
1
,What is the term for the process that increases genetic diversity?
✔✔Sexual reproduction
What is the function of DNA replication?
✔✔To make a copy of DNA before cell division
What is the name of the molecule that stores and transfers energy within cells?
✔✔ATP (adenosine triphosphate)
What is the law of inertia?
✔✔An object at rest stays at rest, and an object in motion stays in motion unless acted upon by
an external force
What is the unit for measuring temperature in the metric system?
✔✔Degrees Celsius
What is an atom’s mass number?
✔✔The total number of protons and neutrons
2
,What is the term for a substance that speeds up a chemical reaction?
✔✔Catalyst
What is the difference between an endothermic and exothermic reaction?
✔✔Endothermic absorbs heat; exothermic releases heat
What is the process by which liquid water becomes water vapor?
✔✔Evaporation
What is the main function of carbohydrates in living organisms?
✔✔To provide energy
What is the smallest unit of matter?
✔✔Atom
What element has the chemical symbol O?
✔✔Oxygen
3
, What is the process by which plants make their own food?
✔✔Photosynthesis
What gas do humans inhale for respiration?
✔✔Oxygen
What is the chemical formula for water?
✔✔H₂O
What organelle is known as the powerhouse of the cell?
✔✔Mitochondria
What type of bond involves the sharing of electrons between atoms?
✔✔Covalent bond
What is the term for a substance made of two or more elements chemically combined?
✔✔Compound
4
Answers | Latest Version | 2025/2026 |
Correct & Verified
What is the function of the liver?
✔✔To detoxify harmful substances and produce bile
What is the term for matter that has a definite volume but no definite shape?
✔✔Liquid
What is the term for the process where cells convert glucose and oxygen into energy?
✔✔Cellular respiration
What is the difference between prokaryotic and eukaryotic cells?
✔✔Prokaryotic cells lack a nucleus; eukaryotic cells have a nucleus
What is the name of the process that produces offspring that are genetically identical?
✔✔Asexual reproduction
1
,What is the term for the process that increases genetic diversity?
✔✔Sexual reproduction
What is the function of DNA replication?
✔✔To make a copy of DNA before cell division
What is the name of the molecule that stores and transfers energy within cells?
✔✔ATP (adenosine triphosphate)
What is the law of inertia?
✔✔An object at rest stays at rest, and an object in motion stays in motion unless acted upon by
an external force
What is the unit for measuring temperature in the metric system?
✔✔Degrees Celsius
What is an atom’s mass number?
✔✔The total number of protons and neutrons
2
,What is the term for a substance that speeds up a chemical reaction?
✔✔Catalyst
What is the difference between an endothermic and exothermic reaction?
✔✔Endothermic absorbs heat; exothermic releases heat
What is the process by which liquid water becomes water vapor?
✔✔Evaporation
What is the main function of carbohydrates in living organisms?
✔✔To provide energy
What is the smallest unit of matter?
✔✔Atom
What element has the chemical symbol O?
✔✔Oxygen
3
, What is the process by which plants make their own food?
✔✔Photosynthesis
What gas do humans inhale for respiration?
✔✔Oxygen
What is the chemical formula for water?
✔✔H₂O
What organelle is known as the powerhouse of the cell?
✔✔Mitochondria
What type of bond involves the sharing of electrons between atoms?
✔✔Covalent bond
What is the term for a substance made of two or more elements chemically combined?
✔✔Compound
4
