Dental Assisting Online for Modern Dental Assisting Test Bank 14th EditionDental Assisting Online for

Test Bank For Dental Assisting for
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Modern Dental Assisting 14th Edition
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Editorsd5:
Jeffreyd5R.d5Smithd5&d5Debbied5S.d5Robinson

,Chapterd51.d5Orald5Embryologyd5andd5Histology



1. Whichd5ofd5thed5followingd5isd5thed5processd5byd5whichd5thed5cellsd5ofd5thed5fertilizedd5egg
d5divided5andd5formd5ad5balld5ofd5cellsd5duringd5embryonicd5development?
A. Cleavage
B. Differentiation
C. Organogenesis
D. Implantation
Answer:d5A.d5Cleavage
Rationale:d5Cleavaged5isd5thed5seriesd5ofd5rapidd5mitoticd5divisionsd5thatd5occurd5afterd5fertil
ization,d5leadingd5tod5thed5formationd5ofd5ad5balld5ofd5cellsd5knownd5asd5thed5morula.
DIF:d5Easy
TOP:d5Embryonicd5developme
ntd5MSC:d5Multipled5Choice
2. Duringd5thed5firstd5weekd5ofd5embryonicd5development,d5thed5fertilizedd5eggd5becomesd5ad
5structured5calledd5a:
A. Zygote
B. Blastocyst
C. Morula
D. Embryo
Answer:d5B.d5Blastocyst
Rationale:d5Afterd5fertilizationd5andd5cleavage,d5thed5balld5ofd5cellsd5(morula)d5formsd5intod5
ad5blastocyst,d5whichd5implantsd5intod5thed5uterined5wall.
DIF:d5Easy
TOP:d5Embryonicd5developme
ntd5MSC:d5Multipled5Choice
3. Thed5orald5cavityd5beginsd5tod5developd5duringd5whichd5ofd5thed5followingd5stagesd5ofd5
embryonicd5development?
A. Zygote
B. Fetal
C. Pre-implantation
D. Embryonic
Answer:d5D.d5Embryonic
Rationale:d5Thed5developmentd5ofd5thed5orald5cavityd5startsd5duringd5thed5embryonicd5stage,
d5aroundd5thed5thirdd5weekd5ofd5pregnancy,d5asd5thed5faciald5structuresd5begind5tod5form.
DIF:d5Moderate
TOP:d5Orald5cavityd5developme
ntd5MSC:d5Multipled5Choice
4. Thed5processd5byd5whichd5thed5neurald5tubed5formsd5andd5beginsd5tod5developd5intod5the
d5braind5andd5spinald5cordd5isd5knownd5as:
A. Gastrulation
B. Neurulation
C. Cleavage
D. Organogenesis

, Answer:d5B.d5Neurulation
Rationale:d5Neurulationd5isd5thed5processd5whered5thed5neurald5tubed5forms,d5whichd5laterd5
givesd5rised5tod5thed5centrald5nervousd5systemd5(braind5andd5spinald5cord).
DIF:d5Moderate
TOP:d5Neurald5developmentd5
MSC:d5Multipled5Choice
5. Whichd5ofd5thed5followingd5isd5thed5primaryd5functiond5ofd5thed5mesodermd5layerd5ind5
embryonicd5development?
A. Formationd5ofd5thed5nervousd5system
B. Developmentd5ofd5thed5skind5andd5hair
C. Formationd5ofd5muscles,d5bones,d5andd5circulatoryd5systems
D. Formationd5ofd5thed5digestived5system
Answer:d5C.d5Formationd5ofd5muscles,d5bones,d5andd5circulatoryd5systems
Rationale:d5Thed5mesodermd5layerd5givesd5rised5tod5structuresd5suchd5asd5muscles,d5bones,d5andd5
thed5circulatoryd5systemd5duringd5embryonicd5development.
DIF:d5Moderated5T
OP:d5Germd5layers
MSC:d5Multipled5Choice
6. Thed5termd5"histology"d5refersd5tod5thed5studyd5of:
A. Thed5structured5andd5functiond5ofd5tissues
B. Thed5developmentd5ofd5organs
C. Thed5structured5ofd5cells
D. Thed5developmentd5ofd5embryos
Answer:d5A.d5Thed5structured5andd5functiond5ofd5tissues
Rationale:d5Histologyd5isd5thed5studyd5ofd5tissues,d5includingd5theird5structured5andd5functio
n,d5andd5theird5roled5ind5thed5body.
DIF:d5Easyd 5 T
OP:d5Histology
MSC:d5Multipled5Choice
7. Thed5enameld5ofd5thed5toothd5isd5derivedd5fromd5whichd5embryonicd5tissue?
A. Ectoderm
B. Mesoderm
C. Endoderm
D. Neurald5crest
Answer:d5A.d5Ectoderm
Rationale:d5Enamel,d5thed5hardd5outerd5surfaced5ofd5thed5tooth,d5developsd5fromd5thed5ectod
ermald5layerd5ofd5thed5embryo.
DIF:d5Moderate
TOP:d5Toothd5developmentd5M
SC:d5Multipled5Choice
8. Thed5developmentd5ofd5thed5faced5andd5orald5cavityd5duringd5embryonicd5developmentd5
involvesd5fusiond5ofd5whichd5structures?
A. Palatald5shelves
B. Maxillaryd5andd5mandibulard5processes
C. Frontald5nasald5process
D. Bothd5Bd5andd5C

, Answer:d5D.d5Bothd5Bd5andd5C
Rationale:d5Thed5developmentd5ofd5thed5faced5andd5orald5cavityd5involvesd5thed5fusiond5ofd5t
hed5maxillaryd5andd5mandibulard5processes,d5asd5welld5asd5thed5frontald5nasald5process.
DIF:d5Moderate
TOP:d5Faciald5developmentd5M
SC:d5Multipled5Choice
9. Whichd5structured5isd5responsibled5ford5thed5formationd5ofd5thed5teethd5duringd5e
mbryonicd5development?
A. Neurald5crest
B. Ectoderm
C. Mesoderm
D. Endoderm
Answer:d5A.d5Neurald5crest
Rationale:d5Thed5neurald5crestd5cellsd5playd5ad5cruciald5roled5ind5thed5formationd5ofd5thed5teethd5d
uringd5embryonicd5development.
DIF:d5Moderate
TOP:d5Toothd5formatio
nd5MSC:d5Multipled5C
hoice
10. Thed5firstd5indicationd5ofd5toothd5developmentd5occursd5duringd5whichd5weekd5ofd5e
mbryonicd5development?
A. 2ndd5week
B. 5thd5week
C. 6thd5week
D. 7thd5week
Answer:d5C.d56thd5week
Rationale:d5Thed5firstd5indicationd5ofd5toothd5developmentd5appearsd5duringd5thed56thd5wee
kd5ofd5embryonicd5development,d5whend5thed5dentald5laminad5forms.
DIF:d5Moderate
TOP:d5Toothd5developmentd5M
SC:d5Multipled5Choice
11. Thed5processd5ofd5ossificationd5refersd5to:
A. Thed5formationd5ofd5bloodd5cells
B. Thed5formationd5ofd5bone
C. Thed5developmentd5ofd5thed5skin
D. Thed5developmentd5ofd5thed5digestived5system
Answer:d5B.d5Thed5formationd5ofd5bone
Rationale:d5Ossificationd5isd5thed5processd5byd5whichd5boned5tissued5isd5formedd5fromd5carti
laged5ord5otherd5connectived5tissue.
DIF:d5Moderate
TOP:d5Boned5development
d5MSC:d5Multipled5Choice
12. Whichd5ofd5thed5followingd5isd5ad5keyd5featured5ofd5thed5histologicald5structured5ofd5enamel?
A. Itd5isd5composedd5ofd5collagend5fibers
B. Itd5isd5avasculard5andd5hasd5nod5livingd5cells
C. Itd5containsd5manyd5bloodd5vessels
D. Itd5hasd5ad5highd5contentd5ofd5water