Competitive Exams: Medical Science MCQs (Practice-Test 61 of 135)

  1. Consider the following statements: Porphyrin ring is present in

    1. haemoglobin

    2. cytochrome

    3. catalase

    4. porphobilinogen

    Which of these statements are correct?

    1. 1, 2 and 3

    2. 1 and 2

    3. 2 and 4

    4. 1, 3 and 4

  2. Over half of the Potassium that appears in the urine of a patient, who has ingested some potassium salts, is derived from

    1. Glomerular filtrate

    2. Secretion by the distal tubule

    3. Reabsorption in the proximal tubule

    4. Secretion by the loop of Henle

  3. Consider the following statements: Blood buffers are

    1. bicarbonates

    2. Haemoglobins

    3. Na proteinate/protein

    Which of the above statemtns are correct?

    1. 1, 2 and 3

    2. 1 and 2

    3. 2 and 3

    4. 1 and 3

  4. Match list I with List II and select the correct answer:

    List-I (Enzymes) List-II (Prosthetic group)
    1. Glycogen phosphorylase

    2. Transketolase

    3. Pyruvate carboxylase

    4. Lactate dehydrogenase

    1. NAD +

    2. Biotin

    3. Thiamine pyrophosphate

    4. NADP +

    5. Pyridoxal phosphate

    • A
    • B
    • C
    • D
      • 3
      • 4
      • 2
      • 5
      • 5
      • 3
      • 2
      • 1
      • 3
      • 2
      • 4
      • 5
      • 5
      • 4
      • 3
      • 1
  5. Consider the following statements; Regulatory enzymes of Glycolysis are

    1. Phospho fructokinase

    2. Enolase

    3. Pyruvate kinase

    4. Aldolase

    Which of the above statements are correct?

    1. 1, 2 and 3

    2. 1 and 4

    3. 2, 3 and 4

    4. 1 and 3

  6. Starting from the 3 ‘end (acceptor arm) the correct sequence (towards 5’ end) of arms in tRNA is

    1. pseudouridine arm, anticodons arm, variable arm, D arm

    2. D arm, anticodons arm, variable arm, pseudouridine arm

    3. Pseudouridine arm, variable arm, anticodons arm, D arm

    4. D arm, variable arm, anticodons arm, pseudouridine arm

  7. The rod receptor potential differs from other sensory receptors in that is shows

    1. Depolarization

    2. Decreased negativity

    3. Increased conductance of Na

    4. Hyperpolarization

  8. Match list I (Types of receptor) with List II (Methods of action potential generation) and select the correct answer:

    List-I List-II
    1. Olfactory receptors

    2. Photoreceptors

    3. Hair cells

    4. Gustatory receptors

    1. Alteration of ionic current through H + gated cation or Na + or K + channel

    2. Mechanically sensitive cation channel

    3. Na + induced Hyperpolarization

    4. Light sensitive Ca2 + channel opening

    • A
    • B
    • C
    • D
      • 3
      • 5
      • 2
      • 1
      • 5
      • 3
      • 1
      • 4
      • 5
      • 3
      • 2
      • 1
      • 3
      • 5
      • 1
      • 4
  9. Consider the following statemtns regarding hemolytic jaundice:

    1. serum conjugated bilirubin is increased

    2. serum unconjugated bilirubin in increased

    3. serum urobilinogen is increased

    4. urine urobilinogen is absent

    Which of the above statements are correct?

    1. 1 and 3

    2. 2 and 4

    3. 2 and 3

    4. 1 and 4

  10. Which one of the following is a substrate for ribonucleotide reductase in the synthesis of deoxyribonucleotide in humans?

    1. ATP

    2. GTP

    3. TDP

    4. UDP

  11. The pyruvate utilization in tissues is decreased in

    1. Pernicious anemia

    2. Scurvy

    3. Beriberi

    4. Pellagra

  12. The major sign of hypoventilation is

    1. Hypoxia

    2. cyanosis

    3. Hypercapnia

    4. Dyspnea

  13. Glomus cells are present in

    1. carotid body

    2. aortic body

    3. aortic arch

    Select the correct answer using the codes given below:

    1. 1, 2 and 3

    2. 1 and 2

    3. 2 and 3

    4. 1 and 3

  14. Which one of the following is associated with conjugated hyperbilirubinemia?

    1. Lucey-Driscoll syndrome

    2. Gilbert's syndrome

    3. Rotor's syndrome

    4. Criglar-Najjar syndrome

  15. Which one of the following is an example of antioxidant endogenous enzyme?

    1. Cytochrome oxidase

    2. Superoxide dismutase

    3. Creatine kinase

    4. Xanthine oxidase