medical MCQs – Page 378

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 Review each marked answer and report any item that may be outdated or unclear.

medical Mcqs

1. oral anatomy 2. microbiology 3. oral pathology and medicine 4. physiology 5. biochemistry 6. general anatomy 7. dental materials 8. pharmacology 9. pathology 10. oral histology

7541. Detoxification of drugs is controlled by_____________?
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A. Cytochrome P450

B. Cytochrome A

C. Cytochrome

D. Cytochrome C

7542. The major fuel for the brain after several weeds of starvation______________?
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A. Glucose

B. Fatty acid

C. Beta hydroxy butyrate

D. Glycerol

7543. Which of the following is present in the plasma but absent in the serum ?
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A. Firbinogen

B. Lecithin

C. Globulin

D. Albumin

7544. Examples of monounsaturted fatty acids are______________?
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A. Linolenic acid

B. Oleic acid

C. Palmitic acid

D. Arachitlonic acid

7545. Indole ring is present in______________?
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A. Tryptophan

B. Methionine

C. Valine

D. Histidine

7546. Iron absorption is decreased in presence of all except____________?
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A. Phosphates

B. Ascorbic acid

C. Tannins

D. Phytates

7547. Chargaff rule states that___________?
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A. A+G=T+C

B. A+T=G+C

C. A/T=G/C

D. A=U=T=G=C

7548. The process by which a base sequence of messenger RNA is synthesized (by a RNA polymerase) on a template of complementary DNA is called______________?
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A. Translation

B. Transduction

C. Translocation

D. Transcription

7549. The following is false about tryptophan_____________?
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A. Non-essential amino acid

B. Involved in serotonin synthesis

C. Involved in melatonin in synthesis

D. Involved in niacin synthesis

7550. The normal range of serum osmolality (in mosm/L) is_____________?
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A. 350 to 375

B. 300 to 320

C. 280 to 295

D. 200 to 250

7551. Enzymes increase reaction rates by______________?
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A. Decreasing the energy of activation

B. Enhancing the forward reaction

C. Altering the free energy of the action

D. Inhibiting the backward reaction

7552. All are true of the genetic code except____________?
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A. Non overlapping

B. Universal

C. Punctuation

D. Degenerate

7553. Iron is present in all, EXCEPT______________?
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A. Pyruvate kinase

B. Myoglobin

C. Catalase

D. Cytochrome

7554. In maple syrup urine disease the amino acids excreted in the urine are______________?
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A. Leucine

B. Isoleucine

C. All of the above

D. Valine

7555. Which of the following is the best site of absorption of calcium ?
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A. Ascending colon

B. Proximal segment of small intestine

C. Middle segment of small intestine

D. Ileum

7556. DNA double helix is bound by_____________?
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A. Covalent bond

B. Vander wall forces

C. Disulfide linkage

D. Hydrogen bond

7557. In the physiological system, nitric oxide is known to act through_______________?
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A. Calcium ions

B. Cyclic GMP

C. Prostacyclins

D. Cyclic AMP

7558. Thiamine deficiency can be diagnosed by measuring________________?
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A. Alkaline phosphatase levels in blood

B. Plasma pyruvate and lactic acid levels

C. Thiamine levels in blood

D. Transketolase activity in RBC

7559. Cholesterol levels in abnormal person should be preferably less than_____________?
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A. 180 mg/dl

B. 150 mg/dl

C. 120 mg/dl

D. 200 mg/dl

7560. Albumins and globulins are ________ proteins?
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A. Peptones

B. Prolamines

C. Lactalbumin

D. Simple

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