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ESSENTIALS OF ORAL HISTOLOGY AND EMBRYOLOGY: A CLINICAL
APPROACH, 6TH EDITION (CHIEGO) EXAM COMPREHENSIVE QUESTIONS
AND CORRECT ANSWERS LATEST EDITION 2026
Essentials of Oral Histology and Embryology: A Clinical Approach, 6th Edition (Chiego) — Exam
Questions with Rationales
Summarized 10-Point Exam Coverage
1. Cell and tissue development — organelles, cell cycle, tissue origins (ectoderm,
mesoderm, endoderm).
2. Structure and function of cells, tissues, and organs — epithelial types, connective tissue,
organ systems.
3. Development of the oral facial region — pharyngeal arches, branchial grooves, facial
sutures, Meckel's cartilage.
4. Development of the face and palate — facial prominences, palatal shelf elevation, cleft
lip and palate.
5. Development of teeth — tooth germ, bud/cap/bell stages, Hertwig's root sheath,
dentinogenesis, amelogenesis.
6. Eruption and shedding of teeth — pre-eruptive, eruptive, posteruptive stages, root
resorption, ankylosis.
7. Enamel — ameloblast differentiation, enamel rods, Hunter-Schreger bands, enamel
proteins.
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8. Dentin — odontoblast differentiation, dentinal tubules, peritubular dentin, predentin,
dentin types.
9. Dental pulp — pulp zones, pulp stones, defensive reactions, age changes.
10. Cementum, periodontium, TMJ, oral mucosa, salivary glands, biofilms — cementum
types, PDL fibers, alveolar bone, TMJ structure, oral mucosa regions, salivary gland
histology, biofilm formation.
Section 1: Development and Structure of Cells and Tissues (Questions 1–20)
Q1. Which organelle produces ATP for intracellular energy?
A. ADP
B. ATP
C. RNA
D. DNA
Correct Answer: B
Rationale: Mitochondria produce energy via ATP (adenosine triphosphate). ADP is a precursor,
not the energy molecule itself; RNA and DNA are nucleic acids involved in protein synthesis and
genetic information, respectively.
Q2. Each tissue originates from mesoderm, EXCEPT one. Which is the EXCEPTION?
A. Bone
B. Liver
C. Blood
D. Muscle
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Correct Answer: B
Rationale: Liver tissue is produced by endodermal cells, whereas bone, blood, and muscle all
develop from mesodermal cells.
Q3. Which chemical is called the second messenger?
A. aDNA
B. mRNA
C. dGMP
D. cAMP
Correct Answer: D
Rationale: cAMP (cyclic adenosine monophosphate) transmits information to intracellular
organelles when activated by surface receptors on the plasma membrane. It is the classic
second messenger.
Q4. Which cellular component facilitates protein synthesis?
A. Ribosomes
B. Lysosomes
C. Mitochondria
D. Plasmalemma
Correct Answer: A
Rationale: Ribosomes synthesize protein. Lysosomes facilitate breakdown of intracellular and
extracellular substances; mitochondria generate energy; the plasmalemma provides a
protective barrier and regulates transport.
Q5. Which organelle produces microtubules?
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A. Nucleus
B. Centriole
C. Golgi apparatus
D. Endoplasmic reticulum
Correct Answer: B
Rationale: Centrioles produce microtubules. The nucleus contains genetic material; the Golgi
apparatus modifies proteins; the endoplasmic reticulum is involved in protein and lipid
synthesis.
Q6. Which phase of the cell cycle is characterized as the initial resting stage?
A. S phase
B. G1 phase
C. G2 phase
D. Prophase
Correct Answer: B
Rationale: The G1 phase is the initial resting stage. The S phase involves DNA synthesis; G2 is
post-DNA duplication; prophase is the first stage of mitosis.
Q7. Posttranslational modifications to proteins produced by the rough endoplasmic reticulum
are accomplished by the:
A. Mitochondria
B. Golgi apparatus
C. Messenger RNA
D. Smooth endoplasmic reticulum
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ESSENTIALS OF ORAL HISTOLOGY AND EMBRYOLOGY: A CLINICAL
APPROACH, 6TH EDITION (CHIEGO) EXAM COMPREHENSIVE QUESTIONS
AND CORRECT ANSWERS LATEST EDITION 2026
Essentials of Oral Histology and Embryology: A Clinical Approach, 6th Edition (Chiego) — Exam
Questions with Rationales
Summarized 10-Point Exam Coverage
1. Cell and tissue development — organelles, cell cycle, tissue origins (ectoderm,
mesoderm, endoderm).
2. Structure and function of cells, tissues, and organs — epithelial types, connective tissue,
organ systems.
3. Development of the oral facial region — pharyngeal arches, branchial grooves, facial
sutures, Meckel's cartilage.
4. Development of the face and palate — facial prominences, palatal shelf elevation, cleft
lip and palate.
5. Development of teeth — tooth germ, bud/cap/bell stages, Hertwig's root sheath,
dentinogenesis, amelogenesis.
6. Eruption and shedding of teeth — pre-eruptive, eruptive, posteruptive stages, root
resorption, ankylosis.
7. Enamel — ameloblast differentiation, enamel rods, Hunter-Schreger bands, enamel
proteins.
1|Page
,Page 2 of 110
8. Dentin — odontoblast differentiation, dentinal tubules, peritubular dentin, predentin,
dentin types.
9. Dental pulp — pulp zones, pulp stones, defensive reactions, age changes.
10. Cementum, periodontium, TMJ, oral mucosa, salivary glands, biofilms — cementum
types, PDL fibers, alveolar bone, TMJ structure, oral mucosa regions, salivary gland
histology, biofilm formation.
Section 1: Development and Structure of Cells and Tissues (Questions 1–20)
Q1. Which organelle produces ATP for intracellular energy?
A. ADP
B. ATP
C. RNA
D. DNA
Correct Answer: B
Rationale: Mitochondria produce energy via ATP (adenosine triphosphate). ADP is a precursor,
not the energy molecule itself; RNA and DNA are nucleic acids involved in protein synthesis and
genetic information, respectively.
Q2. Each tissue originates from mesoderm, EXCEPT one. Which is the EXCEPTION?
A. Bone
B. Liver
C. Blood
D. Muscle
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Correct Answer: B
Rationale: Liver tissue is produced by endodermal cells, whereas bone, blood, and muscle all
develop from mesodermal cells.
Q3. Which chemical is called the second messenger?
A. aDNA
B. mRNA
C. dGMP
D. cAMP
Correct Answer: D
Rationale: cAMP (cyclic adenosine monophosphate) transmits information to intracellular
organelles when activated by surface receptors on the plasma membrane. It is the classic
second messenger.
Q4. Which cellular component facilitates protein synthesis?
A. Ribosomes
B. Lysosomes
C. Mitochondria
D. Plasmalemma
Correct Answer: A
Rationale: Ribosomes synthesize protein. Lysosomes facilitate breakdown of intracellular and
extracellular substances; mitochondria generate energy; the plasmalemma provides a
protective barrier and regulates transport.
Q5. Which organelle produces microtubules?
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A. Nucleus
B. Centriole
C. Golgi apparatus
D. Endoplasmic reticulum
Correct Answer: B
Rationale: Centrioles produce microtubules. The nucleus contains genetic material; the Golgi
apparatus modifies proteins; the endoplasmic reticulum is involved in protein and lipid
synthesis.
Q6. Which phase of the cell cycle is characterized as the initial resting stage?
A. S phase
B. G1 phase
C. G2 phase
D. Prophase
Correct Answer: B
Rationale: The G1 phase is the initial resting stage. The S phase involves DNA synthesis; G2 is
post-DNA duplication; prophase is the first stage of mitosis.
Q7. Posttranslational modifications to proteins produced by the rough endoplasmic reticulum
are accomplished by the:
A. Mitochondria
B. Golgi apparatus
C. Messenger RNA
D. Smooth endoplasmic reticulum
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