medical MCQs – Page 165

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 Review each marked answer and report any item that may be outdated or unclear.

3281. The activity of the following enzyme is affected by biotin deficiency____________?
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A. Transketolase

B. Dehydrogenase

C. Oxidase

D. Carboxylase
3282. Epithelial attachment is derived from____________?
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A. Reduced enamel epithelium

B. Inner enamel epithelium

C. Dental papilla

D. Dental sac

3283. Elongated rete pegs are seen in______________?
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A. Alveolar mucosa

B. Attached gingiva

C. Buccal mucosa

D. Floor of the mouth

3284. Bulk of lamina propria of the gingiva is made of collagen type_______________?
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A. IV

B. III

C. I

D. II

3285. Iron is present in all of the following except_______________?
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A. Cytochrome

B. Myoglobin

C. Pyruvate kinase

D. Catalase

3286. Length of enamel rods is_____________?
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A. Less than the thickness of enamel

B. None of the above

C. Equal to the thickness of enimal

D. Greater than the thickness of enamel
3287. In which type of glycogen storage disease is hyper uricemia a feature ?
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A. IV

B. I

C. II

D. III

3288. The first sign of future deciduous teeth as a thickening of oral ectoderm appears at about_____________?
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A. 34th day of Intra uterine life

B. 56th day of Intra uterine life

C. 25th day of Intra uterine life

D. 20 wks of Intra uterine life

3289. Stratum Germinativum of the oral epithelium is the term given to_______________?
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A. Spinous cells and granular cells

B. Basal cells and parabasal spinous cells

C. Basal cell layer

D. Granular cell layer

3290. Epithelial attachment is_____________?
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A. All of the above

B. Attachment of ameloblasts to the tooth

C. Microscopically it resembles basal lamina

D. Derived from secondary attachment epithelium

3291. The uptake of glucose by the liver increase following a carbohydrate meal because____________?
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A. Glucokinase has a low Km for glucose

B. Hexokinase in liver has a high affinity for glucose

C. GLUT-2 stimulated by insulin

D. There is increase in phosphorylation of glucose by glucokinase
3292. In mineralization which one of the following is known as Epitaxy ?
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A. Booster Mechanism

B. Cartier/s Adenosine Triphosphate theory

C. Alkaline Phosphatase theory

D. Seeding theory
3293. Incremental lines of retzius are seen in______________?
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A. Enamel

B. Cementum

C. Pulp

D. Dentin

3294. The formative cells of which of the following dental tissues disappear once tissue is formed___________?
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A. Enamel

B. Periodontal ligament

C. Cementum

D. Dentin

3295. All these reactions take place inside the mitochondria except____________?
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A. Krebs cylce

B. Electron transfer

C. Urea cycle

D. EMP pathway
3296. Which of the following is not a product of HMP shunt_____________?
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A. NADPH

B. D fructose 6 phosphate

C. D glyceraldehyde 3 phosphate

D. D sedoheptulose 5 phosphate
3297. The activity of this plasma enzyme is responsible virtually for all plasma cholesterol esters in humans_______________?
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A. Lecithin cholesterol acyl transferase (LCAT)

B. HMG CoA reductase

C. Phospho mevalonate kinase

D. Pyrophospho mevalonate decarboxylase

3298. Km of an enzyme is_____________?
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A. Numerically identical for all isozymes that catalyses a given reaction

B. Substrate concentration at half maximal velocity

C. The normal physiological substrate concentration

D. Dissociation constant

3299. Serum alkaline phosphatase level increase in_______________?
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A. Carcinoma of prostate

B. Hyperparathyroidism

C. Myocardial infarction

D. Hypothyroidism

3300. Which of the following is correct of the pyruvate dehydrogenase enzyme complex ?
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A. Requires TPP as cofactor

B. Catalyzes a reversible reaction

C. Catalyzes the conversion of pyruvate to oxaloacetate

D. It is present in cytoplasm