501 Critical Reading Questions

e. buoyed.
385.
Which of the following choices is NOT part of the physical
structure of teeth?
a. pulp cavity
b. dentine
c. cementum
d. tusk
e. enamel
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386.
As used in line 13, what is the best synonym for mastication?
a. digestion
b. tasting
c. biting
d. chewing
e. preparation
387.
Which sentence best describes dentinal tubules?
a. Dentinal tubules are a layer surrounding the dentine of tooth
and tusk roots.
b. Dentinal tubules are micro-canals that radiate outward through
the dentine from the pulp cavity to the exterior cementum border.
c. Dentinal tubules are responsible for the formation of enamel
and are lost after the enamel process is complete.
d. Dentinal tubules cover the surface of the tooth or tusk which
receives the most wear, such as the tip or crown.
e. Dentinal tubules are extremely large teeth projecting beyond
the lips that have evolved from teeth and give certain species an
evolutionary advantage.
388.
According to the passage, all of the following are organic
substances EXCEPT
a. cementum.
b. dentine.
c. dahllite.
d. ameloblasts.
e. collagen.
389.
According to the passage, how can natural ivory be authenticated?
a. by ultraviolet light
b. by gamma rays
c. by physical observation
d. by osmosis
e. by scrimshaw
390.
According to the passage, which statement is NOT true of
enamel?