981. All of the following are part of or arise from the dental organ except the
A. rests of Malassez
B. reduced enamel epithelium
C. epithelial root sheath
D. cervical loop
E. dental sac

982. All of the following may be observed in demineralized sections of mature teeth except
A. intertubular dentin
B. interglobular dentin
C. peritubular dentin
D. reparative dentin
E. globular dentin

983. The major inorganic component of dentin is
A. collagen
B. lactate
C. hydroxyapatite
D. lipid
E. desmosine

984. The presence of Tomes’ processes is associated with the
A. formation of peritubular dentin
B. morphogenic function of dental organ
C. secretory function of dental organ
D. hypomineralized root dentin
E. intratubular nerve endings

985. All of the deciduous dentition has been initiated in utero by the
A. 6th wk
B. 7th wk
C. 8th wk
D. 10th wk
E. 16th wk

986. All of the tooth germs of the primary dentition are usually completed in utero by the
A. 4th mo
B. 6th mo
C. 7th mo
D. 8th mo
E. none of the above

987. The formation of the 1st tooth of the permanent dentition is initated in utero by the
A. 4th mo
B. 5th mo
C. 6th mo
D. 7th mo
E. 8th mo

988. More principal fibers of the periodontal ligament start or end in
A. dentin than bone
B. cementum than bone
C. dentin than cementum
D. bone than cementum
E. gingiva than cementum

989.Which of the following correctly describes a nucleoli characteristic?
A.Ovoid dense bodies.
B.Constitutes the DNA contained in the nucleus.
C.No limiting membrane.
D.Six to eight contained in the nucleus.

990.Which of the following correctly describes ribosomes?
A.Generates genetic codes for proteins.
B.Can be found as separate particles in the cytoplasm.
C.Are specific as to the type of protein they synthesize.
D.Transport substances in the cytoplasm.

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