Test Bank For Dental Assisting for
n n n n n
Modern Dental Assisting 14th Edition
n n n n
Editors n:
Jeffrey nR. nSmith n& nDebbie nS. nRobinson
,Chapter n1. nOral nEmbryology nand nHistology
1. Which nof nthe nfollowing nis nthe nprocess nby nwhich nthe ncells nof nthe nfertilized negg
ndivide nand nform na nball nof ncells nduring nembryonic ndevelopment?
A. Cleavage
B. Differentiation
C. Organogenesis
D. Implantation
Answer: nA. nCleavage
Rationale: nCleavage nis nthe nseries nof nrapid nmitotic ndivisions nthat noccur nafter
nfertilization, nleading nto nthe nformation nof na nball nof ncells nknown nas nthe nmorula.
DIF: nEasy
TOP: nEmbryonic ndevelopment
nMSC: nMultiple nChoice
2. During nthe nfirst nweek nof nembryonic ndevelopment, nthe nfertilized negg nbecomes na
nstructure ncalled na:
A. Zygote
B. Blastocyst
C. Morula
D. Embryo
Answer: nB. nBlastocyst
Rationale: nAfter nfertilization nand ncleavage, nthe nball nof ncells n(morula) nforms ninto na
nblastocyst, nwhich nimplants ninto nthe nuterine nwall.
DIF: nEasy
TOP: nEmbryonic ndevelopment
nMSC: nMultiple nChoice
3. The noral ncavity nbegins nto ndevelop nduring nwhich nof nthe nfollowing nstages nof
nembryonic ndevelopment?
A. Zygote
B. Fetal
C. Pre-implantation
D. Embryonic
Answer: nD. nEmbryonic
Rationale: nThe ndevelopment nof nthe noral ncavity nstarts nduring nthe nembryonic nstage,
naround nthe nthird nweek nof npregnancy, nas nthe nfacial nstructures nbegin nto nform.
DIF: nModerate
TOP: nOral ncavity ndevelopment
nMSC: nMultiple nChoice
4. The nprocess nby nwhich nthe nneural ntube nforms nand nbegins nto ndevelop ninto nthe
nbrain nand nspinal ncord nis nknown nas:
A. Gastrulation
B. Neurulation
C. Cleavage
D. Organogenesis
, Answer: nB. nNeurulation
Rationale: nNeurulation nis nthe nprocess nwhere nthe nneural ntube nforms, nwhich nlater ngives
nrise nto nthe ncentral nnervous nsystem n(brain nand nspinal ncord).
DIF: nModerate
TOP: nNeural ndevelopment
nMSC: nMultiple nChoice
5. Which nof nthe nfollowing nis nthe nprimary nfunction nof nthe nmesoderm nlayer nin
nembryonic ndevelopment?
A. Formation nof nthe nnervous nsystem
B. Development nof nthe nskin nand nhair
C. Formation nof nmuscles, nbones, nand ncirculatory nsystems
D. Formation nof nthe ndigestive nsystem
Answer: nC. nFormation nof nmuscles, nbones, nand ncirculatory nsystems
Rationale: nThe nmesoderm nlayer ngives nrise nto nstructures nsuch nas nmuscles, nbones, nand nthe
ncirculatory nsystem nduring nembryonic ndevelopment.
DIF: nModerate
nTOP: nGerm nlayers
MSC: nMultiple nChoice
6. The nterm n"histology" nrefers nto nthe nstudy nof:
A. The nstructure nand nfunction nof ntissues
B. The ndevelopment nof norgans
C. The nstructure nof ncells
D. The ndevelopment nof nembryos
Answer: nA. nThe nstructure nand nfunction nof ntissues
Rationale: nHistology nis nthe nstudy nof ntissues, nincluding ntheir nstructure nand nfunction,
nand ntheir nrole nin nthe nbody.
DIF: nEasy
n TOP:
nHistology
MSC: nMultiple nChoice
7. The nenamel nof nthe ntooth nis nderived nfrom nwhich nembryonic ntissue?
A. Ectoderm
B. Mesoderm
C. Endoderm
D. Neural ncrest
Answer: nA. nEctoderm
Rationale: nEnamel, nthe nhard nouter nsurface nof nthe ntooth, ndevelops nfrom nthe nectodermal
nlayer nof nthe nembryo.
DIF: nModerate
TOP: nTooth ndevelopment
nMSC: nMultiple nChoice
8. The ndevelopment nof nthe nface nand noral ncavity nduring nembryonic ndevelopment
ninvolves nfusion nof nwhich nstructures?
A. Palatal nshelves
B. Maxillary nand nmandibular nprocesses
C. Frontal nnasal nprocess
D. Both nB nand nC
, Answer: nD. nBoth nB nand nC
Rationale: nThe ndevelopment nof nthe nface nand noral ncavity ninvolves nthe nfusion nof nthe
nmaxillary nand nmandibular nprocesses, nas nwell nas nthe nfrontal nnasal nprocess.
DIF: nModerate
TOP: nFacial ndevelopment
nMSC: nMultiple nChoice
9. Which nstructure nis nresponsible nfor nthe nformation nof nthe nteeth nduring
nembryonic ndevelopment?
A. Neural ncrest
B. Ectoderm
C. Mesoderm
D. Endoderm
Answer: nA. nNeural ncrest
Rationale: nThe nneural ncrest ncells nplay na ncrucial nrole nin nthe nformation nof nthe nteeth nduring
nembryonic ndevelopment.
DIF: nModerate
TOP: nTooth
nformation nMSC:
nMultiple nChoice
10. The nfirst nindication nof ntooth ndevelopment noccurs nduring nwhich nweek nof
nembryonic ndevelopment?
A. 2nd nweek
B. 5th nweek
C. 6th nweek
D. 7th nweek
Answer: nC. n6th nweek
Rationale: nThe nfirst nindication nof ntooth ndevelopment nappears nduring nthe n6th nweek nof
nembryonic ndevelopment, nwhen nthe ndental nlamina nforms.
DIF: nModerate
TOP: nTooth ndevelopment
nMSC: nMultiple nChoice
11. The nprocess nof nossification nrefers nto:
A. The nformation nof nblood ncells
B. The nformation nof nbone
C. The ndevelopment nof nthe nskin
D. The ndevelopment nof nthe ndigestive nsystem
Answer: nB. nThe nformation nof nbone
Rationale: nOssification nis nthe nprocess nby nwhich nbone ntissue nis nformed nfrom ncartilage
nor nother nconnective ntissue.
DIF: nModerate
TOP: nBone ndevelopment
nMSC: nMultiple nChoice
12. Which nof nthe nfollowing nis na nkey nfeature nof nthe nhistological nstructure nof nenamel?
A. It nis ncomposed nof ncollagen nfibers
B. It nis navascular nand nhas nno nliving ncells
C. It ncontains nmany nblood nvessels
D. It nhas na nhigh ncontent nof nwater
n n n n n
Modern Dental Assisting 14th Edition
n n n n
Editors n:
Jeffrey nR. nSmith n& nDebbie nS. nRobinson
,Chapter n1. nOral nEmbryology nand nHistology
1. Which nof nthe nfollowing nis nthe nprocess nby nwhich nthe ncells nof nthe nfertilized negg
ndivide nand nform na nball nof ncells nduring nembryonic ndevelopment?
A. Cleavage
B. Differentiation
C. Organogenesis
D. Implantation
Answer: nA. nCleavage
Rationale: nCleavage nis nthe nseries nof nrapid nmitotic ndivisions nthat noccur nafter
nfertilization, nleading nto nthe nformation nof na nball nof ncells nknown nas nthe nmorula.
DIF: nEasy
TOP: nEmbryonic ndevelopment
nMSC: nMultiple nChoice
2. During nthe nfirst nweek nof nembryonic ndevelopment, nthe nfertilized negg nbecomes na
nstructure ncalled na:
A. Zygote
B. Blastocyst
C. Morula
D. Embryo
Answer: nB. nBlastocyst
Rationale: nAfter nfertilization nand ncleavage, nthe nball nof ncells n(morula) nforms ninto na
nblastocyst, nwhich nimplants ninto nthe nuterine nwall.
DIF: nEasy
TOP: nEmbryonic ndevelopment
nMSC: nMultiple nChoice
3. The noral ncavity nbegins nto ndevelop nduring nwhich nof nthe nfollowing nstages nof
nembryonic ndevelopment?
A. Zygote
B. Fetal
C. Pre-implantation
D. Embryonic
Answer: nD. nEmbryonic
Rationale: nThe ndevelopment nof nthe noral ncavity nstarts nduring nthe nembryonic nstage,
naround nthe nthird nweek nof npregnancy, nas nthe nfacial nstructures nbegin nto nform.
DIF: nModerate
TOP: nOral ncavity ndevelopment
nMSC: nMultiple nChoice
4. The nprocess nby nwhich nthe nneural ntube nforms nand nbegins nto ndevelop ninto nthe
nbrain nand nspinal ncord nis nknown nas:
A. Gastrulation
B. Neurulation
C. Cleavage
D. Organogenesis
, Answer: nB. nNeurulation
Rationale: nNeurulation nis nthe nprocess nwhere nthe nneural ntube nforms, nwhich nlater ngives
nrise nto nthe ncentral nnervous nsystem n(brain nand nspinal ncord).
DIF: nModerate
TOP: nNeural ndevelopment
nMSC: nMultiple nChoice
5. Which nof nthe nfollowing nis nthe nprimary nfunction nof nthe nmesoderm nlayer nin
nembryonic ndevelopment?
A. Formation nof nthe nnervous nsystem
B. Development nof nthe nskin nand nhair
C. Formation nof nmuscles, nbones, nand ncirculatory nsystems
D. Formation nof nthe ndigestive nsystem
Answer: nC. nFormation nof nmuscles, nbones, nand ncirculatory nsystems
Rationale: nThe nmesoderm nlayer ngives nrise nto nstructures nsuch nas nmuscles, nbones, nand nthe
ncirculatory nsystem nduring nembryonic ndevelopment.
DIF: nModerate
nTOP: nGerm nlayers
MSC: nMultiple nChoice
6. The nterm n"histology" nrefers nto nthe nstudy nof:
A. The nstructure nand nfunction nof ntissues
B. The ndevelopment nof norgans
C. The nstructure nof ncells
D. The ndevelopment nof nembryos
Answer: nA. nThe nstructure nand nfunction nof ntissues
Rationale: nHistology nis nthe nstudy nof ntissues, nincluding ntheir nstructure nand nfunction,
nand ntheir nrole nin nthe nbody.
DIF: nEasy
n TOP:
nHistology
MSC: nMultiple nChoice
7. The nenamel nof nthe ntooth nis nderived nfrom nwhich nembryonic ntissue?
A. Ectoderm
B. Mesoderm
C. Endoderm
D. Neural ncrest
Answer: nA. nEctoderm
Rationale: nEnamel, nthe nhard nouter nsurface nof nthe ntooth, ndevelops nfrom nthe nectodermal
nlayer nof nthe nembryo.
DIF: nModerate
TOP: nTooth ndevelopment
nMSC: nMultiple nChoice
8. The ndevelopment nof nthe nface nand noral ncavity nduring nembryonic ndevelopment
ninvolves nfusion nof nwhich nstructures?
A. Palatal nshelves
B. Maxillary nand nmandibular nprocesses
C. Frontal nnasal nprocess
D. Both nB nand nC
, Answer: nD. nBoth nB nand nC
Rationale: nThe ndevelopment nof nthe nface nand noral ncavity ninvolves nthe nfusion nof nthe
nmaxillary nand nmandibular nprocesses, nas nwell nas nthe nfrontal nnasal nprocess.
DIF: nModerate
TOP: nFacial ndevelopment
nMSC: nMultiple nChoice
9. Which nstructure nis nresponsible nfor nthe nformation nof nthe nteeth nduring
nembryonic ndevelopment?
A. Neural ncrest
B. Ectoderm
C. Mesoderm
D. Endoderm
Answer: nA. nNeural ncrest
Rationale: nThe nneural ncrest ncells nplay na ncrucial nrole nin nthe nformation nof nthe nteeth nduring
nembryonic ndevelopment.
DIF: nModerate
TOP: nTooth
nformation nMSC:
nMultiple nChoice
10. The nfirst nindication nof ntooth ndevelopment noccurs nduring nwhich nweek nof
nembryonic ndevelopment?
A. 2nd nweek
B. 5th nweek
C. 6th nweek
D. 7th nweek
Answer: nC. n6th nweek
Rationale: nThe nfirst nindication nof ntooth ndevelopment nappears nduring nthe n6th nweek nof
nembryonic ndevelopment, nwhen nthe ndental nlamina nforms.
DIF: nModerate
TOP: nTooth ndevelopment
nMSC: nMultiple nChoice
11. The nprocess nof nossification nrefers nto:
A. The nformation nof nblood ncells
B. The nformation nof nbone
C. The ndevelopment nof nthe nskin
D. The ndevelopment nof nthe ndigestive nsystem
Answer: nB. nThe nformation nof nbone
Rationale: nOssification nis nthe nprocess nby nwhich nbone ntissue nis nformed nfrom ncartilage
nor nother nconnective ntissue.
DIF: nModerate
TOP: nBone ndevelopment
nMSC: nMultiple nChoice
12. Which nof nthe nfollowing nis na nkey nfeature nof nthe nhistological nstructure nof nenamel?
A. It nis ncomposed nof ncollagen nfibers
B. It nis navascular nand nhas nno nliving ncells
C. It ncontains nmany nblood nvessels
D. It nhas na nhigh ncontent nof nwater
