911. The vagina is lined by this specific type of epithelium
A. transitional
B. stratified squamous keratinizing
C. stratified squamous non-keratinizing
D. pseudostratified columnar
E. stratified cuboidal

912. When a tooth first erupts into the oral cavity, the attached epithelial cuff is composed ofepithelium derived from
A. lamina propria
B. epithelial rests (of Malassez)
C. (Hertwig’s) epithelial root sheath
D. oral mucosa
E. reduced enamel epithelium

913. Tritiated thymidine is a radioisotope that is incorporated into DNA during the s-stage.Consequently, tritiated thymidine may be used to identify dividing cells. Which cellsof the dental organ would you expect would incorporate tritiated thymidine? Cellswhose function is
A. organizing
B. maturation
C. morphogenic
D. protection
E. secretory

914. Which one of the following is a part of the tooth germ (dental/enamel organ)?
A. inner dental epithelium
B. dental sac
C. dental papilla
D. stellate reticulum
E. dental lamina

915. Avitaminosis (scurvey) results in a loosening of the teeth in the sockets chiefly becauseascorbic acid (vitamin C) is needed by
A. osteoblasts to form bone
B. cells to produce collagen
C. odontoblasts to form dentin
D. cells to fight viruses
E. cementoblasts to form cementum

916. Ameloblast differentiation starts at the
A. incisal region of the tooth germ
B. cervical region of the tooth germ
C. junction of IDE and ODE (cervical loop)
D. lateral regions of the tooth germ
E. junction of stratum intermedium and stellate reticulum

917. Which one of the following dental (enamel) organs is usually the first to develop?
A. lst permanent molar
B. 2nd deciduous molar
C. permanent central incisor
D. deciduous central incisor
E. deciduous canine

918. Most principal fibers of the periodontal ligament insert into
A. attached gingiva
B. bone
C. Dentin
D. free gingiva
E. cementum

919. Collagen fibers produced by cementoblasts generally lie in the matrix of cementum
A. parallel to Sharpey’s fibers
B. parallel to the surface of the cementum
C. perpendicular to the dentino-cemental junction
D. randomly
E. either b or d

920. The gingival area where nonkeratinized epithelium most frequently occurs and which,therefore, may be considered most vulnerable to inflammation is the
A. sulcular surface of the free gingiva
B. palatal gingiva
C. unattached gingiva
D. buccal gingiva
E. attached gingiva

NOTE
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