Test Bank For DentalAssistingfor
ModernDentalAssisting 14thEdition
Editors:
JeffreyR. Smith & DebbieS. Robinson
,Chapter1. Oral Embryology andHistology
1. Which of thefollowingis theprocessby which thecellsof thefertilizedeggdivide and form a
ball of cells during embryonic development?
A. Cleavage
B. Differentiation
C. Organogenesis
D. Implantation
Answer:A. Cleavage
Rationale:Cleavageis theseriesof rapid mitoticdivisions thatoccur afterfertilization, leading
to the formation of a ball of cells known as the morula.
DIF: Easy
TOP: Embryonicdevelopment
MSC: Multiple Choice
2. During thefirst weekof embryonicdevelopment,thefertilizedeggbecomesa structure called
a:
A. Zygote
B. Blastocyst
C. Morula
D. Embryo
Answer: B.Blastocyst
Rationale:After fertilizationand cleavage,theball of cells(morula) formsinto a blastocyst,
which implants into the uterine wall.
DIF: Easy
TOP: Embryonicdevelopment
MSC: Multiple Choice
3. The oral cavitybeginsto developduring which of thefollowingstagesof embryonic
development?
A. Zygote
B. Fetal
C. Pre-implantation
D. Embryonic
Answer:D. Embryonic
Rationale:The developmentof theoral cavitystartsduring theembryonicstage,around the
third week of pregnancy, as the facial structures begin to form.
DIF: Moderate
TOP: Oral cavitydevelopment
MSC: Multiple Choice
4. The processby which theneuraltubeformsand beginsto developinto thebrain and spinal
cord is known as:
A. Gastrulation
,B. Neurulation
C. Cleavage
D. Organogenesis
, Answer: B.Neurulation
Rationale:Neurulationis theprocesswheretheneuraltubeforms,which latergivesrise to the
central nervous system (brain and spinal cord).
DIF: Moderate
TOP: Neuraldevelopment MSC:
Multiple Choice
5. Which of thefollowingis theprimaryfunctionof themesodermlayerin embryonic
development?
A. Formationof thenervoussystem
B. Developmentof the skin andhair
C. Formationof muscles,bones, andcirculatorysystems
D. Formationof the digestivesystem
Answer:C. Formationof muscles,bones,and circulatorysystems
Rationale:The mesodermlayergivesrise to structuressuch as muscles,bones,and the circulatory
system during embryonic development.
DIF: Moderate TOP:
Germlayers
MSC: MultipleChoice
6. The term"histology"refers tothestudyof:
A. The structureand function oftissues
B. The development oforgans
C. The structureof cells
D. The developmentof embryos
Answer:A. The structureand functionof tissues
Rationale:Histologyis thestudyof tissues,including theirstructureand function,and their role
in the body.
DIF: Easy TOP:
Histology
MSC: MultipleChoice
7. The enamelof thetoothis derived fromwhich embryonictissue?
A. Ectoderm
B. Mesoderm
C. Endoderm
D. Neuralcrest
Answer:A. Ectoderm
Rationale:Enamel,thehard outersurfaceof thetooth,developsfrom theectodermal layer of
the embryo.
DIF: Moderate
TOP: Tooth development MSC:
Multiple Choice
8. The developmentof thefaceand oral cavityduring embryonicdevelopmentinvolves fusion
of which structures?
A. Palatalshelves
ModernDentalAssisting 14thEdition
Editors:
JeffreyR. Smith & DebbieS. Robinson
,Chapter1. Oral Embryology andHistology
1. Which of thefollowingis theprocessby which thecellsof thefertilizedeggdivide and form a
ball of cells during embryonic development?
A. Cleavage
B. Differentiation
C. Organogenesis
D. Implantation
Answer:A. Cleavage
Rationale:Cleavageis theseriesof rapid mitoticdivisions thatoccur afterfertilization, leading
to the formation of a ball of cells known as the morula.
DIF: Easy
TOP: Embryonicdevelopment
MSC: Multiple Choice
2. During thefirst weekof embryonicdevelopment,thefertilizedeggbecomesa structure called
a:
A. Zygote
B. Blastocyst
C. Morula
D. Embryo
Answer: B.Blastocyst
Rationale:After fertilizationand cleavage,theball of cells(morula) formsinto a blastocyst,
which implants into the uterine wall.
DIF: Easy
TOP: Embryonicdevelopment
MSC: Multiple Choice
3. The oral cavitybeginsto developduring which of thefollowingstagesof embryonic
development?
A. Zygote
B. Fetal
C. Pre-implantation
D. Embryonic
Answer:D. Embryonic
Rationale:The developmentof theoral cavitystartsduring theembryonicstage,around the
third week of pregnancy, as the facial structures begin to form.
DIF: Moderate
TOP: Oral cavitydevelopment
MSC: Multiple Choice
4. The processby which theneuraltubeformsand beginsto developinto thebrain and spinal
cord is known as:
A. Gastrulation
,B. Neurulation
C. Cleavage
D. Organogenesis
, Answer: B.Neurulation
Rationale:Neurulationis theprocesswheretheneuraltubeforms,which latergivesrise to the
central nervous system (brain and spinal cord).
DIF: Moderate
TOP: Neuraldevelopment MSC:
Multiple Choice
5. Which of thefollowingis theprimaryfunctionof themesodermlayerin embryonic
development?
A. Formationof thenervoussystem
B. Developmentof the skin andhair
C. Formationof muscles,bones, andcirculatorysystems
D. Formationof the digestivesystem
Answer:C. Formationof muscles,bones,and circulatorysystems
Rationale:The mesodermlayergivesrise to structuressuch as muscles,bones,and the circulatory
system during embryonic development.
DIF: Moderate TOP:
Germlayers
MSC: MultipleChoice
6. The term"histology"refers tothestudyof:
A. The structureand function oftissues
B. The development oforgans
C. The structureof cells
D. The developmentof embryos
Answer:A. The structureand functionof tissues
Rationale:Histologyis thestudyof tissues,including theirstructureand function,and their role
in the body.
DIF: Easy TOP:
Histology
MSC: MultipleChoice
7. The enamelof thetoothis derived fromwhich embryonictissue?
A. Ectoderm
B. Mesoderm
C. Endoderm
D. Neuralcrest
Answer:A. Ectoderm
Rationale:Enamel,thehard outersurfaceof thetooth,developsfrom theectodermal layer of
the embryo.
DIF: Moderate
TOP: Tooth development MSC:
Multiple Choice
8. The developmentof thefaceand oral cavityduring embryonicdevelopmentinvolves fusion
of which structures?
A. Palatalshelves
