WGU D236 PATHOPHYSIOLOGY OA EXAM 300
QUESTIONS AND CORRECT ANSWERS WITH
DETAILED RATIONALES
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BIOLOGY
Question 1
What is the basic unit of life?
A) Atom
B) Molecule
C) Cell
D) Tissue
Correct Answer: C
Rationale: The cell is the fundamental structural and functional unit of all
living organisms.
Question 2
Which organelle is known as the powerhouse of the cell?
A) Nucleus
B) Ribosome
C) Mitochondria
,D) Golgi apparatus
Correct Answer: C
Rationale: Mitochondria are the sites of aerobic respiration, producing ATP,
the cell's main energy currency.
Question 3
What is the process by which plants make their own food?
A) Respiration
B) Fermentation
C) Photosynthesis
D) Transpiration
Correct Answer: C
Rationale: Photosynthesis uses sunlight, water, and carbon dioxide to produce
glucose and oxygen.
Question 4
Which of the following is not a component of DNA?
A) Adenine
B) Guanine
C) Uracil
D) Cytosine
Correct Answer: C
,Rationale: Uracil is found in RNA, not DNA. DNA contains adenine, guanine,
cytosine, and thymine.
Question 5
What is the largest organ in the human body?
A) Liver
B) Heart
C) Skin
D) Lungs
Correct Answer: C
Rationale: The skin is the largest organ, covering and protecting the body.
Question 6
Which type of blood cells are responsible for fighting infections?
A) Red blood cells
B) Platelets
C) White blood cells
D) Plasma
Correct Answer: C
Rationale: White blood cells (leukocytes) are key components of the immune
system.
Question 7
, What is the pH of pure water?
A) 0
B) 7
C) 14
D) 1
Correct Answer: B
Rationale: Pure water has a neutral pH of 7, meaning it is neither acidic nor
basic.
Question 8
Where does fertilization typically occur in the human female reproductive
system?
A) Ovary
B) Uterus
C) Vagina
D) Fallopian tube
Correct Answer: D
Rationale: Fertilization usually takes place in the ampulla of the fallopian tube.
Question 9
What is the main function of the circulatory system?
A) To digest food
B) To transport oxygen and nutrients
QUESTIONS AND CORRECT ANSWERS WITH
DETAILED RATIONALES
---
BIOLOGY
Question 1
What is the basic unit of life?
A) Atom
B) Molecule
C) Cell
D) Tissue
Correct Answer: C
Rationale: The cell is the fundamental structural and functional unit of all
living organisms.
Question 2
Which organelle is known as the powerhouse of the cell?
A) Nucleus
B) Ribosome
C) Mitochondria
,D) Golgi apparatus
Correct Answer: C
Rationale: Mitochondria are the sites of aerobic respiration, producing ATP,
the cell's main energy currency.
Question 3
What is the process by which plants make their own food?
A) Respiration
B) Fermentation
C) Photosynthesis
D) Transpiration
Correct Answer: C
Rationale: Photosynthesis uses sunlight, water, and carbon dioxide to produce
glucose and oxygen.
Question 4
Which of the following is not a component of DNA?
A) Adenine
B) Guanine
C) Uracil
D) Cytosine
Correct Answer: C
,Rationale: Uracil is found in RNA, not DNA. DNA contains adenine, guanine,
cytosine, and thymine.
Question 5
What is the largest organ in the human body?
A) Liver
B) Heart
C) Skin
D) Lungs
Correct Answer: C
Rationale: The skin is the largest organ, covering and protecting the body.
Question 6
Which type of blood cells are responsible for fighting infections?
A) Red blood cells
B) Platelets
C) White blood cells
D) Plasma
Correct Answer: C
Rationale: White blood cells (leukocytes) are key components of the immune
system.
Question 7
, What is the pH of pure water?
A) 0
B) 7
C) 14
D) 1
Correct Answer: B
Rationale: Pure water has a neutral pH of 7, meaning it is neither acidic nor
basic.
Question 8
Where does fertilization typically occur in the human female reproductive
system?
A) Ovary
B) Uterus
C) Vagina
D) Fallopian tube
Correct Answer: D
Rationale: Fertilization usually takes place in the ampulla of the fallopian tube.
Question 9
What is the main function of the circulatory system?
A) To digest food
B) To transport oxygen and nutrients
