Test Bank For Dental Assisting
for Modern Dental Assisting
14th Edition
Editors :
Jeffrey R. Smith & Debbie S. Robinson
,Chapter 1. Oral Embryology and Histology
1. Which of the following is the process by which the cells of the fertilized egg
divide andform a ball of cells during embryonic development?
A. Cleavage
B. Differentiation
C. Organogenesis
D. Implantation
Answer: A. Cleavage
Rationale: Cleavage is the series of rapid mitotic divisions that occur after
fertilization,leading to the formation of a ball of cells known as the morula.
DIF: Easy
TOP: Embryonic
developmentMSC: Multiple
Choice
2. During the first week of embryonic development, the fertilized egg becomes a
structurecalled a:
A. Zygote
B. Blastocyst
C. Morula
D. Embryo
Answer: B. Blastocyst
Rationale: After fertilization and cleavage, the ball of cells (morula)
forms into ablastocyst, which implants into the uterine wall.
DIF: Easy
TOP: Embryonic
developmentMSC: Multiple
Choice
3. The oral cavity begins to develop during which of the following stages of
embryonicdevelopment?
A. Zygote
B. Fetal
C. Pre-implantation
D. Embryonic
Answer: D. Embryonic
Rationale: The development of the oral cavity starts during the embryonic
stage, aroundthe third week of pregnancy, as the facial structures begin to
form.
DIF: Moderate
, TOP: Oral cavity
developmentMSC:
Multiple Choice
4. The process by which the neural tube forms and begins to develop into the
brain andspinal cord is known as:
A. Gastrulation
B. Neurulation
C. Cleavage
D. Organogenesis
, Answer: B. Neurulation
Rationale: Neurulation is the process where the neural tube forms, which later
gives riseto the central nervous system (brain and spinal cord).
DIF: Moderate
TOP: Neural
developmentMSC:
Multiple Choice
5. Which of the following is the primary function of the mesoderm layer in
embryonicdevelopment?
A. Formation of the nervous system
B. Development of the skin and hair
C. Formation of muscles, bones, and circulatory systems
D. Formation of the digestive system
Answer: C. Formation of muscles, bones, and circulatory systems
Rationale: The mesoderm layer gives rise to structures such as muscles, bones,
and thecirculatory system during embryonic development.
DIF: Moderate
TOP: Germ
layers
MSC: Multiple Choice
6. The term "histology" refers to the study of:
A. The structure and function of tissues
B. The development of organs
C. The structure of cells
D. The development of embryos
Answer: A. The structure and function of tissues
Rationale: Histology is the study of tissues, including their structure and
function, andtheir role in the body.
DIF: Easy
TOP:
Histology
MSC: Multiple Choice
7. The enamel of the tooth is derived from which embryonic tissue?
A. Ectoderm
B. Mesoderm
C. Endoderm
D. Neural crest
Answer: A. Ectoderm
Rationale: Enamel, the hard outer surface of the tooth, develops from the
ectodermallayer of the embryo.
DIF: Moderate
for Modern Dental Assisting
14th Edition
Editors :
Jeffrey R. Smith & Debbie S. Robinson
,Chapter 1. Oral Embryology and Histology
1. Which of the following is the process by which the cells of the fertilized egg
divide andform a ball of cells during embryonic development?
A. Cleavage
B. Differentiation
C. Organogenesis
D. Implantation
Answer: A. Cleavage
Rationale: Cleavage is the series of rapid mitotic divisions that occur after
fertilization,leading to the formation of a ball of cells known as the morula.
DIF: Easy
TOP: Embryonic
developmentMSC: Multiple
Choice
2. During the first week of embryonic development, the fertilized egg becomes a
structurecalled a:
A. Zygote
B. Blastocyst
C. Morula
D. Embryo
Answer: B. Blastocyst
Rationale: After fertilization and cleavage, the ball of cells (morula)
forms into ablastocyst, which implants into the uterine wall.
DIF: Easy
TOP: Embryonic
developmentMSC: Multiple
Choice
3. The oral cavity begins to develop during which of the following stages of
embryonicdevelopment?
A. Zygote
B. Fetal
C. Pre-implantation
D. Embryonic
Answer: D. Embryonic
Rationale: The development of the oral cavity starts during the embryonic
stage, aroundthe third week of pregnancy, as the facial structures begin to
form.
DIF: Moderate
, TOP: Oral cavity
developmentMSC:
Multiple Choice
4. The process by which the neural tube forms and begins to develop into the
brain andspinal cord is known as:
A. Gastrulation
B. Neurulation
C. Cleavage
D. Organogenesis
, Answer: B. Neurulation
Rationale: Neurulation is the process where the neural tube forms, which later
gives riseto the central nervous system (brain and spinal cord).
DIF: Moderate
TOP: Neural
developmentMSC:
Multiple Choice
5. Which of the following is the primary function of the mesoderm layer in
embryonicdevelopment?
A. Formation of the nervous system
B. Development of the skin and hair
C. Formation of muscles, bones, and circulatory systems
D. Formation of the digestive system
Answer: C. Formation of muscles, bones, and circulatory systems
Rationale: The mesoderm layer gives rise to structures such as muscles, bones,
and thecirculatory system during embryonic development.
DIF: Moderate
TOP: Germ
layers
MSC: Multiple Choice
6. The term "histology" refers to the study of:
A. The structure and function of tissues
B. The development of organs
C. The structure of cells
D. The development of embryos
Answer: A. The structure and function of tissues
Rationale: Histology is the study of tissues, including their structure and
function, andtheir role in the body.
DIF: Easy
TOP:
Histology
MSC: Multiple Choice
7. The enamel of the tooth is derived from which embryonic tissue?
A. Ectoderm
B. Mesoderm
C. Endoderm
D. Neural crest
Answer: A. Ectoderm
Rationale: Enamel, the hard outer surface of the tooth, develops from the
ectodermallayer of the embryo.
DIF: Moderate
