,Portage Learning CHEM 103 General Chemistry I Module 3
Exam | 2025 Updated Edition with 100% Verified Answers
Question 1
Which of the following organic macromolecules is a monosaccharide monomer used as
the primary fuel source for ATP synthesis?
A) Glycogen
B) Glucose
C) Triglyceride
D) Insulin
Answer: B) Glucose
Rationale: Glucose is a simple hexose sugar (monosaccharide). It undergoes glycolysis
in the cytosol, followed by the citric acid cycle and oxidative phosphorylation in the
mitochondria to efficiently generate cellular ATP.
Question 2
What metabolic organelle is responsible for generating the majority of cellular energy
(ATP) via aerobic cellular respiration?
A) Lysosome
B) Mitochondria
C) Sarcoplasmic reticulum
D) Ribosome
Answer: B) Mitochondria
Rationale: Mitochondria are double-membraned organelles that house the electron
transport chain and ATP synthase enzymes, making them the primary site of aerobic
ATP production.
Question 3
Which epidermal layer consists of a single row of stem cells that undergo rapid mitosis
to continuously replace shed outer skin cells?
A) Stratum corneum
B) Stratum granulosum
C) Stratum basale
D) Stratum spinosum
Answer: C) Stratum basale
, Rationale: The stratum basale is the deepest, most metabolically active layer of the
epidermis. It contains highly mitotic stem cells that continuously divide to produce new
keratinocytes.
Question 4
Which skin layer contains the main networks of blood vessels, sensory nerves, hair
follicles, and sweat glands?
A) Epidermis
B) Dermis
C) Stratum corneum
D) Stratum lucidum
Answer: B) Dermis
Rationale: The dermis is the vascularized, connective tissue layer of the skin located
beneath the avascular epidermis. It supports all the major skin accessory structures and
nerve endings.
Question 5
Which specialized bone cells are responsible for synthesizing the organic matrix,
promoting mineralization, and building new bone tissue?
A) Osteoclasts
B) Osteoblasts
C) Osteocytes
D) Chondrocytes
Answer: B) Osteoblasts
Rationale: Osteoblasts are bone-building cells that secrete osteoid (collagen matrix) and
assist in calcium salt mineralization. Osteoclasts are responsible for bone resorption
(breakdown).
Question 6
A joint that is functionally classified as a synarthrosis is defined as being:
A) Freely movable
B) Slightly movable
C) Completely immovable
D) Surrounded by a fluid-filled synovial cavity
Answer: C) Completely immovable
Rationale: Structural joints are classified functionally by their mobility: synarthroses are
immovable (e.g., skull sutures), amphiarthroses are slightly movable, and diarthroses
are freely movable.
Exam | 2025 Updated Edition with 100% Verified Answers
Question 1
Which of the following organic macromolecules is a monosaccharide monomer used as
the primary fuel source for ATP synthesis?
A) Glycogen
B) Glucose
C) Triglyceride
D) Insulin
Answer: B) Glucose
Rationale: Glucose is a simple hexose sugar (monosaccharide). It undergoes glycolysis
in the cytosol, followed by the citric acid cycle and oxidative phosphorylation in the
mitochondria to efficiently generate cellular ATP.
Question 2
What metabolic organelle is responsible for generating the majority of cellular energy
(ATP) via aerobic cellular respiration?
A) Lysosome
B) Mitochondria
C) Sarcoplasmic reticulum
D) Ribosome
Answer: B) Mitochondria
Rationale: Mitochondria are double-membraned organelles that house the electron
transport chain and ATP synthase enzymes, making them the primary site of aerobic
ATP production.
Question 3
Which epidermal layer consists of a single row of stem cells that undergo rapid mitosis
to continuously replace shed outer skin cells?
A) Stratum corneum
B) Stratum granulosum
C) Stratum basale
D) Stratum spinosum
Answer: C) Stratum basale
, Rationale: The stratum basale is the deepest, most metabolically active layer of the
epidermis. It contains highly mitotic stem cells that continuously divide to produce new
keratinocytes.
Question 4
Which skin layer contains the main networks of blood vessels, sensory nerves, hair
follicles, and sweat glands?
A) Epidermis
B) Dermis
C) Stratum corneum
D) Stratum lucidum
Answer: B) Dermis
Rationale: The dermis is the vascularized, connective tissue layer of the skin located
beneath the avascular epidermis. It supports all the major skin accessory structures and
nerve endings.
Question 5
Which specialized bone cells are responsible for synthesizing the organic matrix,
promoting mineralization, and building new bone tissue?
A) Osteoclasts
B) Osteoblasts
C) Osteocytes
D) Chondrocytes
Answer: B) Osteoblasts
Rationale: Osteoblasts are bone-building cells that secrete osteoid (collagen matrix) and
assist in calcium salt mineralization. Osteoclasts are responsible for bone resorption
(breakdown).
Question 6
A joint that is functionally classified as a synarthrosis is defined as being:
A) Freely movable
B) Slightly movable
C) Completely immovable
D) Surrounded by a fluid-filled synovial cavity
Answer: C) Completely immovable
Rationale: Structural joints are classified functionally by their mobility: synarthroses are
immovable (e.g., skull sutures), amphiarthroses are slightly movable, and diarthroses
are freely movable.
