Competitive Exams: Medical Science MCQs (Practice-Test 49 of 135)

  1. Which one of the following strains of Escherichia coli produces a toxin that is identical to the Shiga toxin produced by Shigella dysenteriae?

    1. Enterotoxigenic E. Coli (ETEc)

    2. Enteroinvasive E. Coli (ElEc)

    3. Enterohaemorrhagic E. Coli (EHEc)

    4. Enteropathogenic

    5. coli (EPEc)

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

    List-I (Type of vibrio) List-II (Property)
    1. Vibrio cholerae

    2. Vibrio parahaemolyticus

    3. Vibrio alginolyticus

    4. Vibrio vulnificus

    1. Halophilic vibrio

    2. Does not grow on TCBS medium

    3. Noninvasive vibrio

    4. Lactose fermenting

    5. positive konagawa phenomenon

    • A
    • B
    • C
    • D
      • 1
      • 2
      • 3
      • 4
      • 2
      • 3
      • 1
      • 5
      • 3
      • 5
      • 2
      • 1
      • 3
      • 5
      • 1
      • 4
  3. The only DNA virus that utilizes a reverse transcriptase during replication is

    1. adeno virus

    2. hepatitis B virus

    3. Epstein-Barr virus

    4. pox virus

  4. Consider the following events:

    1. penetration of ookinete in wall of midgut of the mosquito

    2. Ingestion of male and female gametocytes and their fertilization

    3. Rupture of oocyst in to the maemocoele of mosquito and release of sporozites into the salivary glands.

    The correct sequence of these events in the life of malarial parasite is:

    1. 2, 3, 1

    2. 1, 2, 3

    3. 2, 1, 3

    4. 3, 1, 2

  5. Which one of the following is the primary function of basal ganglia?

    1. Sensory motor integration

    2. Planning voluntary movement

    3. Detection of error in the movement

    4. Regulation of muscle tone during change in posture

  6. Match List I (Behavioural correlaes) with List II (Activity of neural tract/nuclei) and select the correct answer:

    List-I List-II
    1. Arousal alertness

    2. Sleep

    3. Hypotonia

    1. Inhibitory reticulospinal tract

    2. Stimulation of intralaminar and anterior nucleus of thalamus

    3. Stimulation of diagonal band and preoptic area

    • A
    • B
    • C
      • 2
      • 1
      • 3
      • 3
      • 2
      • 1
      • 3
      • 1
      • 2
      • 1
      • 3
      • 2
  7. Administration of LH to a healthy Youngman may cause

    1. Secretion of androgens by testes

    2. Contraction epididymis

    3. Decreased spermatogenesis

    4. Contraction of seminiferous tubules

  8. Which one of the following statements is most correct about HCG during pregnancy?

    1. It increases slowly in concentration throuout pregnancy

    2. It decreases the concentration of estrogen and progesterone in the blood

    3. It decreases in concentration about the middle of the first trimester of pregnancy

    4. It increases the concentration of estrogen and progesterone throughout pregnancy

  9. When an average healthy 20-year old individual changes from a standing posture to running, with a maximal effort he is capable of increasing his stroke volume

    1. two-fold

    2. four-fold

    3. six-fold

    4. eight-fold

  10. Consider the following statements: The difference in the action potential records of SA node and single ventricular muscle fiber is due to

    1. much lesser negativity of the ‘resting’ potential.

    2. ‘inactivation’ of fast sodium channels.

    3. activation of slow calcium-sodium channels

    Which of the above statements are correct?

    1. 1 and 3

    2. 2 and 3

    3. 1 and 2

    4. 1, 2 and 3

  11. Myocardial oxygen demand is

    1. Inversely proportional to heart rate

    2. Directly proportional to heart rate

    3. Increased by digitalis

    4. Not related to heart rate

  12. consider the following events:

    1. Increased wash out of CO2 from pulmonary blood.

    2. Increase in blood pO2.

    3. Increasein pO2 of respiratory neurons.

    4. Depression of respiratory center.

    The correct sequence of these events leading to apnoes in Cheyne-Stokes breathing is

    1. 1, 2, 3, 4

    2. 2, 3, 4, 1

    3. 2, 1, 3, 4

    4. 4, 1, 2, 3

  13. The principles of counter current system are applicable to:

    1. the kidney tubules to build up osmotic gradient in the medullary pyramid to form concentrated urine.

    2. the skin to maintain the body temperature

    3. the testes to maintain the testicular temperature and concentration of testosterone.

    Select the correct answer using the codes given below:

    1. 1 and 2

    2. 2 and 3

    3. 3 only

    4. 1, 2 and 3

  14. Conjugation of bile acid is important for all of the following EXCEPT:

    1. Increasing the resistance to hydrolysis by pancreatic enzymes

    2. Decreasing the hydrophilicity

    3. Decreasing the ability to traverse the membrane by passing diffusion

    4. Increasing acidic strength of side chain

  15. The intestinal absorption of which one of the following will NOT be affected in the absence of glycocholic and taurocholic acids?

    1. Oleic acid

    2. Cholesterol

    3. Vitamin C

    4. Vitamin A