WGU D312 ANATOMY AND PHYSIOLOGY I
OBJECTIVE ASSESSMENT ACTUAL EXAM 2025-
2026 QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES || 100%
GUARANTEED PASS <RECENT VERSION>
Cellular Biology & Tissues
1. What is the primary function of the ribosomes?
A) Lipid synthesis
B) Protein synthesis ✓
C) ATP production
D) Detoxification
Rationale: Ribosomes, whether free in the cytoplasm or bound to the endoplasmic reticulum,
are the site of protein synthesis (translation) within a cell.
2. Which organelle is responsible for packaging proteins into vesicles for transport?
A) Mitochondria
B) Golgi Apparatus ✓
C) Rough Endoplasmic Reticulum
D) Nucleolus
Rationale: The Golgi apparatus modifies, sorts, and packages proteins received from the rough
ER into vesicles for secretion or delivery to other organelles.
3. During which phase of mitosis do chromosomes line up at the equatorial plate?
A) Prophase
B) Metaphase ✓
C) Anaphase
D) Telophase
Rationale: Metaphase is characterized by the alignment of chromosomes at the center
(metaphase plate) of the cell, preparing them for separation.
4. What is the process by which a cell engulfs a large, solid particle?
A) Pinocytosis
B) Phagocytosis ✓
,C) Exocytosis
D) Facilitated Diffusion
Rationale: Phagocytosis ("cell eating") is a form of endocytosis where cells engulf large particles
like bacteria or cellular debris.
5. Which type of tissue is specialized for the conduction of electrical impulses?
A) Muscle tissue
B) Epithelial tissue
C) Nervous tissue ✓
D) Connective tissue
Rationale: Nervous tissue, composed of neurons and neuroglia, is excitable and specialized for
generating and transmitting nerve impulses.
6. Simple squamous epithelium is best suited for what function?
A) Protection
B) Secretion
C) Diffusion and Filtration ✓
D) Stretching
Rationale: Its single layer of flat cells provides a thin barrier that is ideal for rapid diffusion of
gases and filtration of fluids, as seen in the alveoli of the lungs and kidney glomeruli.
7. Glands that secrete hormones directly into the blood are classified as:
A) Exocrine glands
B) Endocrine glands ✓
C) Merocrine glands
D) Apocrine glands
Rationale: Endocrine glands are ductless and release their secretions (hormones) directly into
the extracellular fluid, which then diffuses into the bloodstream.
8. Which of the following is a characteristic of connective tissue?
A) It is composed primarily of cells.
B) It lines body cavities.
C) It is highly vascular (with exceptions like tendons and ligaments). ✓
D) It has a basement membrane.
Rationale: Unlike epithelial tissue, most connective tissue is vascular, which allows for a good
blood supply. Cartilage is an avascular exception, and tendons/ligaments are relatively poorly
vascularized.
9. The process of mRNA synthesis from a DNA template is called:
A) Translation
,B) Replication
C) Transcription ✓
D) Mitosis
Rationale: Transcription is the process where the genetic code in DNA is copied into a
complementary mRNA strand in the nucleus.
10. Which type of solution would cause a red blood cell to swell and potentially burst
(hemolyze)?
A) Hypertonic
B) Isotonic
C) Hypotonic ✓
D) Osmotic
Rationale: In a hypotonic solution, the solute concentration is lower outside the cell than inside.
Water moves into the cell by osmosis, causing it to swell and burst.
Integumentary System
11. The outermost layer of the epidermis is the:
A) Stratum basale
B) Stratum corneum ✓
C) Stratum spinosum
D) Stratum lucidum
Rationale: The stratum corneum is the most superficial layer, composed of dead, keratinized
cells that protect against abrasion and water loss.
12. What is the primary function of melanin?
A) To waterproof the skin
B) To provide sensory perception
C) To protect against UV radiation ✓
D) to regulate body temperature
Rationale: Melanin is a pigment produced by melanocytes that absorbs harmful ultraviolet (UV)
radiation, protecting DNA in skin cells from mutations.
13. Which layer of the skin contains blood vessels, hair follicles, and sweat glands?
A) Epidermis
B) Dermis ✓
C) Hypodermis
D) Stratum basale
, Rationale: The dermis is the thick, connective tissue layer beneath the epidermis that houses
these structures, as well as nerve endings and sebaceous glands.
14. Eccrine sweat glands are primarily involved in:
A) Lubricating the skin
B) Producing pheromones
C) Thermoregulation ✓
D) Producing ear wax
Rationale: Eccrine glands are distributed over most of the body and secrete a watery sweat that
cools the body through evaporation.
15. The hypodermis is primarily composed of what type of tissue?
A) Dense irregular connective tissue
B) Adipose and loose connective tissue ✓
C) Stratified squamous epithelium
D) Reticular tissue
Rationale: The hypodermis (subcutaneous layer) is mainly adipose tissue, which serves as
insulation and energy storage, and loose connective tissue that connects the skin to underlying
muscles.
Skeletal System & Joints
16. The foramen magnum is a feature of which bone?
A) Frontal bone
B) Temporal bone
C) Occipital bone ✓
D) Sphenoid bone
Rationale: The foramen magnum is the large opening in the base of the occipital bone through
which the spinal cord connects to the brainstem.
17. Which cell type is responsible for bone resorption?
A) Osteoblast
B) Osteocyte
C) Osteoclast ✓
D) Chondrocyte
Rationale: Osteoclasts are large, multinucleated cells that break down bone matrix (resorption),
releasing minerals into the blood.
OBJECTIVE ASSESSMENT ACTUAL EXAM 2025-
2026 QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES || 100%
GUARANTEED PASS <RECENT VERSION>
Cellular Biology & Tissues
1. What is the primary function of the ribosomes?
A) Lipid synthesis
B) Protein synthesis ✓
C) ATP production
D) Detoxification
Rationale: Ribosomes, whether free in the cytoplasm or bound to the endoplasmic reticulum,
are the site of protein synthesis (translation) within a cell.
2. Which organelle is responsible for packaging proteins into vesicles for transport?
A) Mitochondria
B) Golgi Apparatus ✓
C) Rough Endoplasmic Reticulum
D) Nucleolus
Rationale: The Golgi apparatus modifies, sorts, and packages proteins received from the rough
ER into vesicles for secretion or delivery to other organelles.
3. During which phase of mitosis do chromosomes line up at the equatorial plate?
A) Prophase
B) Metaphase ✓
C) Anaphase
D) Telophase
Rationale: Metaphase is characterized by the alignment of chromosomes at the center
(metaphase plate) of the cell, preparing them for separation.
4. What is the process by which a cell engulfs a large, solid particle?
A) Pinocytosis
B) Phagocytosis ✓
,C) Exocytosis
D) Facilitated Diffusion
Rationale: Phagocytosis ("cell eating") is a form of endocytosis where cells engulf large particles
like bacteria or cellular debris.
5. Which type of tissue is specialized for the conduction of electrical impulses?
A) Muscle tissue
B) Epithelial tissue
C) Nervous tissue ✓
D) Connective tissue
Rationale: Nervous tissue, composed of neurons and neuroglia, is excitable and specialized for
generating and transmitting nerve impulses.
6. Simple squamous epithelium is best suited for what function?
A) Protection
B) Secretion
C) Diffusion and Filtration ✓
D) Stretching
Rationale: Its single layer of flat cells provides a thin barrier that is ideal for rapid diffusion of
gases and filtration of fluids, as seen in the alveoli of the lungs and kidney glomeruli.
7. Glands that secrete hormones directly into the blood are classified as:
A) Exocrine glands
B) Endocrine glands ✓
C) Merocrine glands
D) Apocrine glands
Rationale: Endocrine glands are ductless and release their secretions (hormones) directly into
the extracellular fluid, which then diffuses into the bloodstream.
8. Which of the following is a characteristic of connective tissue?
A) It is composed primarily of cells.
B) It lines body cavities.
C) It is highly vascular (with exceptions like tendons and ligaments). ✓
D) It has a basement membrane.
Rationale: Unlike epithelial tissue, most connective tissue is vascular, which allows for a good
blood supply. Cartilage is an avascular exception, and tendons/ligaments are relatively poorly
vascularized.
9. The process of mRNA synthesis from a DNA template is called:
A) Translation
,B) Replication
C) Transcription ✓
D) Mitosis
Rationale: Transcription is the process where the genetic code in DNA is copied into a
complementary mRNA strand in the nucleus.
10. Which type of solution would cause a red blood cell to swell and potentially burst
(hemolyze)?
A) Hypertonic
B) Isotonic
C) Hypotonic ✓
D) Osmotic
Rationale: In a hypotonic solution, the solute concentration is lower outside the cell than inside.
Water moves into the cell by osmosis, causing it to swell and burst.
Integumentary System
11. The outermost layer of the epidermis is the:
A) Stratum basale
B) Stratum corneum ✓
C) Stratum spinosum
D) Stratum lucidum
Rationale: The stratum corneum is the most superficial layer, composed of dead, keratinized
cells that protect against abrasion and water loss.
12. What is the primary function of melanin?
A) To waterproof the skin
B) To provide sensory perception
C) To protect against UV radiation ✓
D) to regulate body temperature
Rationale: Melanin is a pigment produced by melanocytes that absorbs harmful ultraviolet (UV)
radiation, protecting DNA in skin cells from mutations.
13. Which layer of the skin contains blood vessels, hair follicles, and sweat glands?
A) Epidermis
B) Dermis ✓
C) Hypodermis
D) Stratum basale
, Rationale: The dermis is the thick, connective tissue layer beneath the epidermis that houses
these structures, as well as nerve endings and sebaceous glands.
14. Eccrine sweat glands are primarily involved in:
A) Lubricating the skin
B) Producing pheromones
C) Thermoregulation ✓
D) Producing ear wax
Rationale: Eccrine glands are distributed over most of the body and secrete a watery sweat that
cools the body through evaporation.
15. The hypodermis is primarily composed of what type of tissue?
A) Dense irregular connective tissue
B) Adipose and loose connective tissue ✓
C) Stratified squamous epithelium
D) Reticular tissue
Rationale: The hypodermis (subcutaneous layer) is mainly adipose tissue, which serves as
insulation and energy storage, and loose connective tissue that connects the skin to underlying
muscles.
Skeletal System & Joints
16. The foramen magnum is a feature of which bone?
A) Frontal bone
B) Temporal bone
C) Occipital bone ✓
D) Sphenoid bone
Rationale: The foramen magnum is the large opening in the base of the occipital bone through
which the spinal cord connects to the brainstem.
17. Which cell type is responsible for bone resorption?
A) Osteoblast
B) Osteocyte
C) Osteoclast ✓
D) Chondrocyte
Rationale: Osteoclasts are large, multinucleated cells that break down bone matrix (resorption),
releasing minerals into the blood.
