HESI A2 VERSION 2 BIOLOGY EXAM
QUESTIONS & ANSWERS (VERIFIED
ANSWERS) WITH EXPERT
EXPLANATIONS | 2026 – 2027 UPDATE
(PDF)
1. Which property of water allows it to act as a versatile solvent in biological systems?
A. High specific heat
B. Low density when frozen
C. Polarity
D. High heat of vaporization
Answer: C
Conceptual Explanation: Water’s polarity allows it to form hydrogen bonds with other
polar or ionic substances, facilitating their dissolution and transport in biological systems.
2. Which biological molecule is primarily responsible for long-term energy storage in animals?
A. Starch
B. Glycogen
C. Triglycerides
D. Cellulose
,Answer: C
Conceptual Explanation: While glycogen provides short-term energy storage, lipids like
triglycerides are the primary form of long-term energy storage in animal tissues.
3. Which of the following describes a saturated fatty acid?
A. Lacks double bonds between carbon atoms in the hydrocarbon chain
B. Is typically liquid at room temperature
C. Contains one or more double bonds between carbons
D. Is a major component of plant oils
Answer: A
Conceptual Explanation: Saturated fatty acids have no double bonds between carbon
atoms, meaning they are ‘saturated’ with hydrogen atoms and are typically solid at room
temperature.
4. In the hierarchical organizational system of biology, which level is immediately below
‘Order’?
A. Family
B. Class
C. Genus
D. Phylum
Answer: A
, Conceptual Explanation: The taxonomic hierarchy is: Kingdom, Phylum, Class, Order,
Family, Genus, Species. Family follows Order.
5. Which organelle is responsible for the detoxification of various toxins and the metabolism
of lipids?
A. Rough Endoplasmic Reticulum
B. Smooth Endoplasmic Reticulum
C. Golgi Apparatus
D. Lysosome
Answer: B
Conceptual Explanation: The Smooth ER is involved in lipid synthesis, carbohydrate
metabolism, and detoxification of drugs and poisons.
6. What is the primary function of the nucleolus within a eukaryotic cell?
A. DNA replication
B. ATP production
C. Ribosome synthesis
D. Protein folding
Answer: C
QUESTIONS & ANSWERS (VERIFIED
ANSWERS) WITH EXPERT
EXPLANATIONS | 2026 – 2027 UPDATE
(PDF)
1. Which property of water allows it to act as a versatile solvent in biological systems?
A. High specific heat
B. Low density when frozen
C. Polarity
D. High heat of vaporization
Answer: C
Conceptual Explanation: Water’s polarity allows it to form hydrogen bonds with other
polar or ionic substances, facilitating their dissolution and transport in biological systems.
2. Which biological molecule is primarily responsible for long-term energy storage in animals?
A. Starch
B. Glycogen
C. Triglycerides
D. Cellulose
,Answer: C
Conceptual Explanation: While glycogen provides short-term energy storage, lipids like
triglycerides are the primary form of long-term energy storage in animal tissues.
3. Which of the following describes a saturated fatty acid?
A. Lacks double bonds between carbon atoms in the hydrocarbon chain
B. Is typically liquid at room temperature
C. Contains one or more double bonds between carbons
D. Is a major component of plant oils
Answer: A
Conceptual Explanation: Saturated fatty acids have no double bonds between carbon
atoms, meaning they are ‘saturated’ with hydrogen atoms and are typically solid at room
temperature.
4. In the hierarchical organizational system of biology, which level is immediately below
‘Order’?
A. Family
B. Class
C. Genus
D. Phylum
Answer: A
, Conceptual Explanation: The taxonomic hierarchy is: Kingdom, Phylum, Class, Order,
Family, Genus, Species. Family follows Order.
5. Which organelle is responsible for the detoxification of various toxins and the metabolism
of lipids?
A. Rough Endoplasmic Reticulum
B. Smooth Endoplasmic Reticulum
C. Golgi Apparatus
D. Lysosome
Answer: B
Conceptual Explanation: The Smooth ER is involved in lipid synthesis, carbohydrate
metabolism, and detoxification of drugs and poisons.
6. What is the primary function of the nucleolus within a eukaryotic cell?
A. DNA replication
B. ATP production
C. Ribosome synthesis
D. Protein folding
Answer: C
