NUR 155 Galen College Exams 2, 3 & 4 |
150+ Practice Questions, Answers &
Rationales | 2025 Study Guide
1. Which of the following is the smallest unit of life?
A) Atom
B) Molecule
C) Cell
D) Tissue
Answer: C
Rationale: The cell is the basic structural, functional, and biological unit of all
known living organisms. Atoms and molecules are non-living components, while
tissues are made of cells.
2. What is the chemical symbol for Gold?
A) Go
B) Gd
C) Au
D) Ag
Answer: C
Rationale: Au comes from the Latin word for gold, aurum. Ag is silver, and Gd is
Gadolinium.
3. Which organelle is known as the "powerhouse of the cell"?
A) Ribosome
B) Nucleus
C) Mitochondria
D) Golgi apparatus
Answer: C
Rationale: Mitochondria are responsible for cellular respiration, converting
glucose and oxygen into ATP (energy) for the cell.
4. What is the pH of a neutral substance?
A) 0
,B) 7
C) 10
D) 14
Answer: B
Rationale: The pH scale ranges from 0 to 14. A pH of 7 is neutral, representing
pure water. Below 7 is acidic, and above 7 is basic.
5. Which planet is known as the "Red Planet"?
A) Venus
B) Jupiter
C) Mars
D) Saturn
Answer: C
Rationale: Mars has a reddish appearance due to iron oxide (rust) on its surface.
6. What is the force that opposes motion between two surfaces in contact?
A) Gravity
B) Inertia
C) Friction
D) Magnetism
Answer: C
Rationale: Friction is the resistive force that acts opposite to the direction of
motion or attempted motion of an object.
7. What is the main gas responsible for global warming?
A) Oxygen
B) Nitrogen
C) Carbon Dioxide
D) Argon
Answer: C
Rationale: Carbon dioxide (CO₂) is a greenhouse gas that traps heat in the
atmosphere, contributing significantly to global warming.
8. Which of the following is not a type of blood cell?
A) Erythrocyte
B) Leukocyte
C) Thrombocyte
, D) Hepatocyte
Answer: D
Rationale: Erythrocytes (red), Leukocytes (white), and Thrombocytes (platelets)
are blood cells. Hepatocytes are liver cells.
9. What is the speed of light approximately in a vacuum?
A) 3 x 10⁶ m/s
B) 3 x 10⁸ m/s
C) 3 x 10¹⁰ m/s
D) 3 x 10⁴ m/s
Answer: B
Rationale: The speed of light in a vacuum is a constant value of approximately
299,792,458 meters per second, commonly rounded to 3 x 10⁸ m/s.
10. What is the atomic number of Carbon?
A) 4
B) 6
C) 8
D) 12
Answer: B
Rationale: The atomic number corresponds to the number of protons. Carbon has
6 protons.
11. Which system in the human body is responsible for transporting nutrients
and oxygen?
A) Respiratory system
B) Digestive system
C) Circulatory system
D) Nervous system
Answer: C
Rationale: The circulatory system (heart, blood, and blood vessels) is the
transport system for oxygen, nutrients, and waste products.
12. Which of these is a renewable energy source?
A) Coal
B) Natural gas
C) Solar energy
150+ Practice Questions, Answers &
Rationales | 2025 Study Guide
1. Which of the following is the smallest unit of life?
A) Atom
B) Molecule
C) Cell
D) Tissue
Answer: C
Rationale: The cell is the basic structural, functional, and biological unit of all
known living organisms. Atoms and molecules are non-living components, while
tissues are made of cells.
2. What is the chemical symbol for Gold?
A) Go
B) Gd
C) Au
D) Ag
Answer: C
Rationale: Au comes from the Latin word for gold, aurum. Ag is silver, and Gd is
Gadolinium.
3. Which organelle is known as the "powerhouse of the cell"?
A) Ribosome
B) Nucleus
C) Mitochondria
D) Golgi apparatus
Answer: C
Rationale: Mitochondria are responsible for cellular respiration, converting
glucose and oxygen into ATP (energy) for the cell.
4. What is the pH of a neutral substance?
A) 0
,B) 7
C) 10
D) 14
Answer: B
Rationale: The pH scale ranges from 0 to 14. A pH of 7 is neutral, representing
pure water. Below 7 is acidic, and above 7 is basic.
5. Which planet is known as the "Red Planet"?
A) Venus
B) Jupiter
C) Mars
D) Saturn
Answer: C
Rationale: Mars has a reddish appearance due to iron oxide (rust) on its surface.
6. What is the force that opposes motion between two surfaces in contact?
A) Gravity
B) Inertia
C) Friction
D) Magnetism
Answer: C
Rationale: Friction is the resistive force that acts opposite to the direction of
motion or attempted motion of an object.
7. What is the main gas responsible for global warming?
A) Oxygen
B) Nitrogen
C) Carbon Dioxide
D) Argon
Answer: C
Rationale: Carbon dioxide (CO₂) is a greenhouse gas that traps heat in the
atmosphere, contributing significantly to global warming.
8. Which of the following is not a type of blood cell?
A) Erythrocyte
B) Leukocyte
C) Thrombocyte
, D) Hepatocyte
Answer: D
Rationale: Erythrocytes (red), Leukocytes (white), and Thrombocytes (platelets)
are blood cells. Hepatocytes are liver cells.
9. What is the speed of light approximately in a vacuum?
A) 3 x 10⁶ m/s
B) 3 x 10⁸ m/s
C) 3 x 10¹⁰ m/s
D) 3 x 10⁴ m/s
Answer: B
Rationale: The speed of light in a vacuum is a constant value of approximately
299,792,458 meters per second, commonly rounded to 3 x 10⁸ m/s.
10. What is the atomic number of Carbon?
A) 4
B) 6
C) 8
D) 12
Answer: B
Rationale: The atomic number corresponds to the number of protons. Carbon has
6 protons.
11. Which system in the human body is responsible for transporting nutrients
and oxygen?
A) Respiratory system
B) Digestive system
C) Circulatory system
D) Nervous system
Answer: C
Rationale: The circulatory system (heart, blood, and blood vessels) is the
transport system for oxygen, nutrients, and waste products.
12. Which of these is a renewable energy source?
A) Coal
B) Natural gas
C) Solar energy
