74. At which of the following ages does fetal movement first occur?

A. 1 month B. 2 months

C. 4 months D. 6 months E. 7 months


The correct answer is B. Neuromuscular development is sufficient to allow fetal movement in the

eighth week of life. Other features of Week 8 include the first appearance of a thin skin, a head as

large as the rest of the body, forward-looking eyes, appearance of digits on the hands and feet,

appearance of testes and ovaries (but not distinguishable external genitalia), and a crown-rump length

of approximately 30 mm. By the end of the eighth week, nearly all adult structures have at least begun to 

develop, and the fetus "looks like a baby." 

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73. Mosquito borne transmission appears to be the method of spread in:

a. St. Louis encephalitis   b. Histoplasmosis

c. Typhus  d. Toxoplasmosis

ANS.  A



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72. Which cusp on the primary mandibular first molar is highest and sharpest?

A. Mesiobuccal       B. Distobuccal

C. Mesiolingual        D. Distolingual



ANS.  C. The primary first mandibular molar is a highly unusual tooth. It is molar-like

in form, with two roots (mesial and distal), but has a very pronounced mesial development of the

crown. The mesial section comprises two-thirds of the crown, and the distal portion is much reduced.

The mesiolingual cusp is the highest and sharpest, although the mesiobuccal is overall largest as

viewed from the occlusal. It is followed in size by the ML, DB, and DL cusps.

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