medical MCQs – Page 152

Practise multiple-choice questions from medical for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

3021. True about osteoclasts_____________?
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A. Monocytes are precursor cells of osteoclasts

B. All of the above are true

C. Contain lysosomes with acid phosphates

D. The plasma membrane of osteoclasts adjacent to bone that is being resorbed is known as striated or ruffled border

3022. Which of the following is correct?
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A. Dead tracts appear black in transmitted and white in reflected ligth

B. Reparative dentin is characterized by having fewer and more twisted tubules than normal dentin and may include odontoblasts

C. Sclerotic transparent dentin appears transparent or light in transmitted light and dark in reflected light

D. All of the above
3023. All of the following cells of periodontal ligament are of mesenchymal origin except______________?
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A. Multi totipotent cells

B. Cementoblasts

C. Cell rests of malassez

D. Fibroblasts

3024. Inorganic content of cementum is______________?
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A. 60 to 65%

B. 55 to 60%

C. 45 to 50%

D. 50 to 55%

3025. Width of the periodontal ligament is least at______________?
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A. Fulcrum of rotation

B. It has uniform width

C. Cervical third

D. Apical third

3026. Which of the following statement is correct?
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A. Enamel cannot form in absence of dentin

B. The formation of enamel and dentin are independent of each other

C. Enamel formation can occur in absence of dentin

D. None of the above

3027. Neonatal line is also referred to as______________?
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A. Line of enamel tufts

B. Incremental lines

C. Line of cross striations

D. Retzius line

3028. Among the following the structure that is most calcified is_______________?
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A. Enamel spindle

B. Enamel tuft

C. Enamel rod

D. Enamel lamella

3029. The normal pH of the saliva is about_____________?
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A. 9.5

B. 7.5

C. 8.5

D. 5.5

3030. Pericytes are found___________?
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A. Along with heparin on surface of mast cells

B. Around capillaries of pulp

C. In gallbladder

D. In thymus

3031. Fibres which continue from bone to ligament are_______________?
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A. Sharpeys fibres

B. Tomes fibres

C. All of the above

D. Rays fibres

3032. Which of the following enzymes are involved in bone formation________________?
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A. Alkaline phosphatase and urease

B. Alkaline phosphatase and phosphorylase

C. Catalase and phosphorylase

D. Acid phosphatase and catalase

3033. Age changes in periodeontal ligament include which of the following ?
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A. Decreased in number of cementicles

B. Increased vascularity

C. Increased thickness

D. Increased fibroplasia
3034. Which of the following is true of cellular cementum ?
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A. Formation is a slow process

B. Seen at the coronal portion of the tooth

C. Forms during root formation

D. Forms after the eruption of the tooth
3035. The cementuoenamel junction is approximately at the level at which the root canal becomes_____________?
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A. Twisted

B. Pulp chamber

C. Curved

D. Lateral canal

3036. If overgrowth of cementum does not improve the functional qualities of cementum, it is termed as_____________?
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A. Hypertrophy

B. Hyperplasia

C. Hypoplasia

D. Excementoses

3037. Mirgration of odontoblasts into dentinal tubules occurs during ________________?
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A. Cavity preparation

B. Water irrigation

C. Dehydration

D. None of the above

3038. Which of the following is a rare occurrence______________?
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A. Enamel meet cementum at a point

B. Enamel overlaps cementum

C. Cementum overlaps enamel

D. Both never meet

3039. Enamel can act in a sense like a_______________?
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A. Infrapermeable membrane

B. Semipermeable membrane

C. Permeable membrane

D. Impermeable membrane

3040. Shape of crown and the size of the roots is determined by______________?
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A. Dentin

B. Pulp

C. Enamel

D. Cementum