A. Alanine B. Arginine
C. Isoleucine D. Leucine
E. Phenylalanine
The correct answer is B. This question requires two logical steps. First, you need to appreciate that hydrophilic amino acids are more likely to appear on the surface of a protein molecule, whereas hydrophobic amino acids are most likely be found in the interior. Next, you need to figure out which of the amino acids listed is hydrophilic. If you recall that arginine is a basic amino acid that is positively charged at physiologic pH, you should be able to answer this question right away.
All the other choices have neutral side chains and are uncharged at physiologic pH. They would most likely be found in the hydrophobic core of the protein structure. Alanine (choice A), isoleucine (choice C), and leucine (choice D) all have aliphatic side chains; phenylalanine (choice E) and tryptophan have aromatic side chains.
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83.Which of the following will cause reduction of the size of the pulp chamber in mid-life?
B. Formation of secondary dentin
C. Internal resorption
D. External resorption
E. Pulp fibrosis
The correct answer is B. Primary dentin (choice A) surrounds the pulp chamber when the tooth is
first formed and erupts. It is the initial dentin that makes up the base of both the crown and root. If the
young tooth has a given size pulp chamber, further dentin formation, secondary dentin, later in life, will
begin to fill the chamber with dentin, making it smaller. Internal resorption (choice C) is loss of dentin,
resulting in a larger pulp chamber. External resorption (choice D) involves the exterior of the root and
does not change the pulp chamber size. Pulp fibrosis (choice E) would change the histology of the
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82.Towne’s projection is a:
a. A-p view b. P-a
c. Lateral d. Panoramic
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c. Lateral d. Panoramic
Ans: a. Antero-posterior view
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81.In restoring a mandibular first molar, lingual cusps are important for which movement?
A. Centric occlusion B. Protrusive
C. Retrusive D. Working E. Nonworking
ANS. D. To answer this question, place your own teeth in centric occlusion (maximum intercuspation). Notice that the occlusion is held in place by the lingual cusps of maxillary teeth and the buccal cusps of mandibular teeth. Mandibular lingual cusps are not in contact. In protrusion, the anterior teeth act to separate the maxilla and mandible as the mandible moves forward. The anterior teeth act as guides in retrusion as well (try it). So far the mandibular lingual cusps are not involved. If you make a left working movement (slide your mandible left), notice that the mandibular lingual cusps on the left, drag against the lingual side of the maxillary lingual cusps. In the nonworking side (in this case, the right side), the mandibular lingual cusps move AWAY from contact.
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C. Retrusive
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80. Which of the following hormones is secreted by anterior pituitary cells that stain with acidic dyes?
A. ACTH B. FSH
C. LH D. Prolactin
ANS. D. The cells of the anterior pituitary can be classified as chromophils (stain
with dyes) or chromophobes (do not stain with dyes). The chromophils can be further divided in acidophils (stain with acidic dyes) and basophils (stain with basic dyes). The acidophils include the somatotrophs, which secrete growth hormone, and the mammotrophs, which secrete prolactin. The basophils include the corticotrophs, which secrete ACTH (choice A), the gonadotrophs, which secrete FSH and LH (choices B and C), and the thyrotrophs, which secrete TSH (choice E).
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C. LH
ANS. D. The cells of the anterior pituitary can be classified as chromophils (stain
with dyes) or chromophobes (do not stain with dyes). The chromophils can be further divided in
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